Master Plumber Practice Exam - 2024 Codes

View Answers as You Go

View 1 Question at a Time

Administrative Policies and Procedures

1.	Code interpretation is a critical element of success when working with the code requirements and regulations. Who does the code authorize to interpret the plumbing code?
		a. A master plumber
		b. A journeyman plumber
		c. A licensed code enforcement officer
		d. Both a and c
Of the possible answers, only a licensed code officer who is an authority having jurisdiction is the one who is allowed to interpret the code. (IPC 104.2; UPC 103.1). Whether a plumbing installation passes or fails an inspection is subject to a code officer's interpretation. You can appeal a decision that you feel is incorrect or questionable. Even as a master plumber your understanding of the intent of the code is not absolute. The plumbing inspector is the final word in the field when it comes to an interpretation of the code. Incorrect answer. Please choose another answer.

2.	Which of the following plumbing fixtures requires a plumbing permit and inspection for the replacement of the fixture in the same exact location?
		a. Water closet
		b. Lavatory
		c. Water heater
		d. All of the above
Pipe and fixtures to be replaced require a permit. (IPC 105.2; UPC 104.2; 502.1). A water closet may be removed and reinstalled in order to clear a stoppage, replace a leaking wax seal or after a new floor has been installed but a water closet cannot be replaced without a permit. Incorrect answer. Please choose another answer.

3.	Approved plans and specs must be kept on a job site and available for inspection on demand by a code officer.
		a. True
		b. False
True - Approved plans and specifications are required for every major job. (IPC 105.5.7; UPC 104.4.6). These documents are required to be stored on the job site. You must have them available to code officers on demand. Incorrect answer. Please choose another answer.

4.	A plumbing permit can only be obtained by a master plumber.
		a. True
		b. False
False - The plumbing code allows homeowners to obtain plumbing permits for work to be done on their own residences when the homeowners will do the work themselves. (IPC 105.3; UPC 104.3). When homeowners obtain a permit, they must do the work themselves. This policy sometimes only applies to the homeowner's primary residence. Incorrect answer. Please choose another answer.

5.	As a master plumber you will be allowed to apply for plumbing permits. Which of the following data will you be required to provide on a plumbing permit application?
		a. Your full name and address
		b. A full description of the plumbing work you propose to do
		c. The zoned use of the property where the plumbing will be installed
		d. All of the above
The application for a plumbing permit requires key information that you, as the master plumber applying for the permit, must supply. Information needed for the application will include the following: • Applicant's full name • Applicant's complete address • A full description of all work to be performed • The number of plumbing fixtures to be installed • The type of plumbing fixtures to be installed • The type of use of the structure where the plumbing is being installed • Additional data may also be required, such as your plumbing license number, detailed plans and specifications and so forth. Incorrect answer. Please choose another answer.

6.	Assume that you are bidding a job that will require significant repair and alteration work to an existing plumbing system. Your work will include the replacement of valves on the water distribution system and the installation of a backflow preventer on the water supply. You have been asked to replace old cast-iron cleanouts with plastic cleanouts so that they can be used more easily. As you contemplate this work you must design a plan that will not __________.
		a. Require a plumbing permit
		b. Render the plumbing system unsafe
		c. Have any detrimental effect on the plumbing system
		d. Both b and c
When you send a crew in to repair or alter existing plumbing you must take into consideration that the existing system shall not be made unsafe or altered in any way that will have a negative effect on the performance of the plumbing. (IPC 102.4; UPC 102.2). Incorrect answer. Please choose another answer.

7.	As you are computing a bid for a contractor, you are asked if you can cut your costs by using plumbing materials that were previously used. The economy has most people looking for cheaper prices. You do not like the idea of working with used parts and pipes, but you agree to look into it. It is allowable to use previously-used plumbing materials in a new plumbing system.
		a. True
		b. False
True - It is allowable to use plumbing materials that have been used previously under certain conditions. (IPC 1409.1). The plumbing materials must be of an approved type. All of the material must be in good working order. You should seek approval from a plumbing code officer to approve the specified materials. If these conditions are met, it is allowable to reuse previously used plumbing parts and fixtures. Incorrect answer. Please choose another answer.

8.	You are replacing fixtures in a restaurant. The owner is remodeling and has decided to upgrade some of the older fixtures. This is fairly simple work since all of the fixtures being replaced will be replaced with new fixtures in the exact same location of the older fixtures. Knowing this, which of the following fixtures will you be required to obtain a plumbing permit to replace?
		a. Food preparation sinks
		b. Water heaters
		c. Grease traps
		d. All of the above
Pipe and fixtures to be replaced require a permit. (IPC 105.2; UPC 104.2; 502.1). Pipe and fixtures may be removed and reinstalled in order to clear a stoppage, replace a leaking wax seal or after a new floor has been installed but piping and fixtures cannot be replaced without a permit. Incorrect answer. Please choose another answer.

9.	Assume that you are responsible for the plumbing work needed to allow the demolition of a structure. The job description requires the removal of all existing water meters provided by the local municipality. You are also charged with removing all sewer connections to building sewers. As a plumber, you are responsible for the discontinuation of the piping, which will include providing suitable termination on the municipal piping.
		a. True
		b. False
False - Municipalities generally restrict plumbers from working on municipal plumbing components. (IPC 109.3; 114.6.3; UPC 105.4, 106.5). It is common for municipalities to provide a variety of plumbing devices that can include piping, water meters, pressure-reducing valves, piping, fittings and other devices. Generally, a plumber is required to work on systems within five feet of a building foundation. However, some cities install equipment within a foundation. When this is the case, plumbers are responsible for work done beyond the installation. Incorrect answer. Please choose another answer.

10.	For the issuance of a plumbing permit, which of the following is normally required?
		a. Design plans
		b. Complete specifications
		c. A description of the use of the building
		d. All of the above
When you apply for a plumbing permit you must provide a full description of the work to be done. (IPC 105.3; UPC 104.3). Plumbing plans are often required for larger jobs. Specifications of all materials to be installed are a common requirement for a plumbing permit. Permit applications require the physical address of the property to receive plumbing services. The use of the property is often required. It makes a difference if a structure is a home or a daycare. The owner's name of the proper is generally required. You are also required to detail the number and type of plumbing fixtures to be installed. Incorrect answer. Please choose another answer.

11.	Assume that you have been awarded a plumbing permit to install plumbing in an auto repair shop. The building contractor gave you a start date for your work. However, weather conditions have restricted the process of the building contractor. Hence, your work has had to be rescheduled. Your permit could become invalid if work is not started soon. How long do you, as the plumber, have from the time a permit is issued to begin work without running the risk of losing your permit?
		a. Two months
		b. Three months
		c. Six months
		d. Eight months
Your plumbing permit can be rendered invalid if work is not started within six months from the day that the permit is issued. (IPC 105.5.3; UPC 104.4.3). Don't panic. Most code officers will work with you if there are situations beyond your control that delay the start of the work. A code officer has some latitude in this matter. If you have a valid reason for your inability to begin work, you are likely to be awarded an extension. Incorrect answer. Please choose another answer.

12.	If alterations are made in an existing plumbing system, the work is required to bring the entire existing plumbing system up to current code requirements.
		a. True
		b. False
False - Plumbing alterations should comply with current code requirements. The alterations made must be in compliance with present code requirements. However, the remainder of the existing plumbing system is not required to be upgraded to modern code requirements. (IPC 102.4; UPC 102.2). Incorrect answer. Please choose another answer.

13.	It is a violation of the plumbing code to change the use of a property. As an example, if a residential home is converted to professional office space, it is a violation of the plumbing code.
		a. True
		b. False
True - Plumbing codes require different minimum standards for various types of building uses. For example, the minimum number of fixtures required for a building can vary substantially based on the use of a building. Accessibility requirements that do not apply to a residence can apply to an office building or business. There are several situations where everything from pipe sizing to the number of fixtures required can be different for various types of building uses. In order to change the use of a building within compliance to code requirements a plan and specifications must be submitted to the code enforcement office for approval. Incorrect answer. Please choose another answer.

14.	What is the purpose of the plumbing code?
		a. To generate revenue for a jurisdiction through fees
		b. To control the plumbing work
		c. To protect the plumbing industry from unlicensed plumbers
		d. To have a legally enforceable document to safeguard property and public welfare
The main purpose of a plumbing code is to safeguard the health, safety, property and public welfare of a community. It becomes legally enforceable when it is adopted by a governing body with jurisdiction. Incorrect answer. Please choose another answer.

15.	What is the main responsibility of a plumbing code official?
		a. To collect permit fees
		b. To write new plumbing regulations
		c. To ensure the use of quality plumbing materials
		d. To enforce the plumbing regulations for the public good
A plumbing code official has the responsibility for establishing that the residences and commercial buildings in the community are designed and constructed in such a way to be reasonably free from hazards associated with the presence and use of plumbing appliances, appurtenances, fixtures and systems. Incorrect answer. Please choose another answer.

16.	What is the code intended to establish?
		a. To allow the collection of revenue
		b. To create work for the plumbers
		c. To establish a minimum standard for safety
		d. To establish a maximum installation requirement for plumbing manufactures to follow
The code is intended to establish a minimum acceptable standard for plumbing material and installation so that the public welfare is maintained. Incorrect answer. Please choose another answer.

17.	When can a change in occupancy take place without inspection?
		a. If the home is less than 2,000 square feet
		b. When the occupancy is related to the owner
		c. Inspections are not required for occupancy changes
		d. A change in occupancy cannot be done without inspection
A plumbing inspection must be done before an occupancy permit can be issued. It is unlawful to make any change in the occupancy of a building without approval of a code official. (IPC 102.5; UPC 102.6). The code official must certify that the structure meets the provisions of the law governing the plumbing code and that any change does not result in hazards to the public health, safety or welfare. Incorrect answer. Please choose another answer.

18.	When a building is moved is a plumbing permit required?
		a. Only if the building is 10 years old or older
		b. Only if the building is over 900 square feet in living space
		c. Only If the building is used for commercial use
		d. All moved buildings are subject to the same code requirements as a new building.
Buildings that have been relocated are subject to the requirements of the code as if they were new construction. (IPC 102.7; UPC 102.7). Placing a building where one did not previously exist is analogous to construction a new building. It is the intent of plumbing code to require alteration of the existing plumbing systems to the extent necessary to bring them into compliance with the provision of the plumbing code applicable to new construction and make the existing plumbing system comply. Incorrect answer. Please choose another answer.

19.	When will a less stringent local plumbing code supersede state and federal codes?
		a. Never
		b. On minor plumbing work only
		c. On Installation instructions from the manufacturer
		d. Only on new construction work
The provisions of a local plumbing code will not be deemed to supersede state or federal law unless they exceed the requirements of the state or federal law, making the local requirement more stringent. (IPC 102.1; UPC 102.1). This occurs only if the state or federal authority permits preemption. Incorrect answer. Please choose another answer.

20.	Who appoints the plumbing code official?
		a. The local plumbing union
		b. The chief appointing authority of the jurisdiction
		c. The head of the health department
		d. The local registered plumbing contractors
The chief appointing authority, as determined jurisdiction-by-jurisdiction, is responsible for hiring all plumbing code officials. (IPC 103.2; UPC 103.1). Incorrect answer. Please choose another answer.

21.	Can an alternative design be used and, if so, who has the authority to approve an alternative plumbing design?
		a. No. Alternative designs that do not meet the requirements of the code cannot be used.
		b. Yes, and only the Code Official may approve an alternative design
		c. Yes, the architect has the authority to approve a new plumbing design.
		d. Yes, the engineer can approve the new plumbing design
New construction or renovation designs may propose alternative materials, designs or methods of construction that are not described or addressed by the plumbing code. To use an alternative material, design or method of construction, an application must be made to the code official. (IPC 104.2.3.2; UPC 301.3). Incorrect answer. Please choose another answer.

22.	If tests are required to obtain approval of an alternative design, what criteria is used to determine whether the alternative design is acceptable?
		a. Equivalency
		b. Cost
		c. Differentiation
		d. All of the above
The codes use an equivalency standard to determine if an alternative material, design or method of construction is acceptable to be used in construction or renovation. (IPC 104.2.3.4; UPC 301.3). A code official may require testing of the proposed alternative or other form of substantiation, like research reports. For the alternative material, design or method of construction to be approved, it must be proven to be not less than equivalent to those materials, designs and methods of construction set forth in the code. The criteria to determine equivalence includes the factors of quality, strength, effectiveness, durability and safety, including fire safety. Incorrect answer. Please choose another answer.

23.	A journeyman plumber is installing a water heater and an installation issue implicating the structural integrity of the plumbing system and safety arises that is not covered by the plumbing code or manufacturer's instructions. What course of action should the plumber take?
		a. The plumber has the discretion to handle the issue in his or her best professional judgment.
		b. Have the master plumber decide how to handle the matter.
		c. The owner has the final say on how to handle the issue.
		d. The code official should be contacted and asked to give instructions.
When a plumbing issue arises that impacts the strength, stability or operation of the plumbing system, and the issue is not covered by the plumbing code or manufacturer's instructions, the matter is to be decided by the code official. (IPC 102.9; UPC 103.1). Incorrect answer. Please choose another answer.

A plumbing installation in a new commercial building that is attempting to obtain LEED certification involves a plumbing design for a graywater reuse system that is not specifically proscribed by the plumbing code.

24.	Can an alternative design be used and, if so, who has the authority to approve an alternative plumbing design?
		a. No. Alternative designs that do not meet the requirements of the code cannot be used.
		b. Yes, and only the Code Official may approve an alternative design
		c. Yes, the architect has the authority to approve a new plumbing design.
		d. Yes, the engineer can approve the new plumbing design
New construction or renovation designs may propose alternative materials, designs or methods of construction that are not described or addressed by the plumbing code. To use an alternative material, design or method of construction, an application must be made to the code official. (IPC 104.2.3.2; UPC 301.3). Incorrect answer. Please choose another answer.

25.	If tests are required to obtain approval of an alternative design, what criteria is used to determine whether the alternative design is acceptable?
		a. Equivalency
		b. Cost
		c. Differentiation
		d. All of the above
The codes use an equivalency standard to determine if an alternative material, design or method of construction is acceptable to be used in construction or renovation. (IPC 104.2.3.4; UPC 301.3). A code official may require testing of the proposed alternative or other form of substantiation, like research reports. For the alternative material, design or method of construction to be approved, it must be proven to be not less than equivalent to those materials, designs and methods of construction set forth in the code. The criteria to determine equivalence includes the factors of quality, strength, effectiveness, durability and safety, including fire safety. Incorrect answer. Please choose another answer.

26.	Inspections are required at a number of critical stages of construction. Which of the following inspections are required before the installation of wall and ceiling membranes?
		a. Underground inspection
		b. Rough-in inspection
		c. Camera inspection
		d. Final inspection
There are three critical stages for inspections of construction by code officials: (1) underground inspection of trenches or ditches with piping before backfill is put in place; (2) rough-in inspection after the framing and water supply and drainage piping is roughed-in; and (3) final inspection when all the work is complete and the plumbing system connected and ready for occupancy. (IPC 111.2; UPC 105.2). Incorrect answer. Please choose another answer.

General Regulations

27.	The plumbing code applies to new installations. Which of the following types of plumbing work may also be governed by the code?
		a. Renovations
		b. Replacement of plumbing fixtures
		c. Additions to a plumbing system
		d. All of the above
All new installations are required to comply with the plumbing code. Other elements that may be required to meet current code requirements can include renovations, the replacement of fixtures, additions to a plumbing system and extensive repairs to plumbing systems. At no time can work done to a plumbing system make it unsafe or be detrimental to the system. Incorrect answer. Please choose another answer.

28.	Assume that a customer has called your office and requested that you replace an existing kitchen sink with a new sink. The new sink will be of the same size and basic type as the existing sink. You will be able to remove the old sink and place the new one in the existing hole. Which of following options bests describes your situation?
		a. A plumbing permit is not required.
		b. In order to replace the sink, you will need a permit.
		c. Removal of the existing sink will trigger a code requirement that calls for the drainage piping to be brought up to current code standards.
		d. An air gap will be required to be installed on the new sink.
A plumbing permit will be required for the direct replacement of a kitchen sink. (IPC 105.2; UPC 104.2; 502.1). Fixtures may be removed and reinstalled in order to clear a stoppage, replace a leaking wax seal or after a new floor has been installed but piping and fixtures cannot be replaced without a permit. Existing plumbing will not be required to be brought up to current code standards, unless there is a health or safety issue. (IPC 102.4; UPC 102.2). Incorrect answer. Please choose another answer.

29.	Your job requires you to schedule maintenance on a large commercial building for one of your customers. What is the required frequency for the inspection of backflow preventers?
		a. Once a month
		b. Once every 3 months
		c. Once every 4 months
		d. Once every year
Annual inspections are required for backflow assemblies. (IPC 312.11.1; UPC 603.4.2). Each backflow preventer should be tested during the inspection. They must be working properly and must not allow contamination to the water source in a water distribution system. New installations are required to be inspected. Any need to repair a backflow preventer triggers the need for a test and inspection of the repaired device. Incorrect answer. Please choose another answer.

30.	You should expect to supply the code enforcement office with a site plan before any work is done on an existing sewer or water service.
		a. True
		b. False
True - Code officers generally require a site plan and specifications on file before any work is commenced on an existing water service or sewer. The location of existing piping and the proposed location for new piping should all be included on the site plan. You should expect the sanitary district and the local water purveyor to be involved as well. Incorrect answer. Please choose another answer.

31.	Assume that you have been contracted to add a new bathroom group to an existing plumbing system. This is a toilet, lavatory and bathtub that will be installed in a new addition to a home. You will need a permit for the installation. Your plan is to connect the main drain from the bathroom group to the building drain. This could create a problem. From the choices below, choose the most likely concern.
		a. The extra fixture units from the new bathroom group could put a total fixture-unit load on the existing building drain that would require the building drain to be replaced with a larger pipe.
		b. Requirements for accessible plumbing fixtures
		c. Minimum distance requirements between fixtures
		d. The fact that water fountains cannot be installed in a room that contains a toilet
Adding new plumbing fixtures can overload existing plumbing. You must compute the total fixture-unit ratings and the demand that it will put on existing plumbing piping. It is possible that an existing pipe might have to be removed and replaced with a larger pipe. Incorrect answer. Please choose another answer.

32.	What circumstances will prompt a code officer to issue a stop work order?
		a. For minor violations of the code.
		b. An immediate danger is present.
		c. Plans and specifications are not available on the job site.
		d. Any of the above
Code officers are authorized to issue and post stop work orders when any work is being done contrary to the provisions of the code and where immediate danger is present, possible or pending. (IPC 115.1; UPC 106.4). Minor violations will not usually result in a stop work order, but the code officer will direct the minor violation to be brought into compliance. Code violations must be serious to be considered contrary to the code. When a stop work order is posted all work on a site must cease. The stop work order will bear the name of the issuing inspector. You should contact the inspector to determine what must be done to allow work to begin again. Do not continue to work if a stop work order has been posted. The penalties can be steep if you do. Incorrect answer. Please choose another answer.

33.	When working with engineered trusses, you must be aware of certain limitations that do not apply to trusses made of dimensional lumber. For example, an engineered truss must not be ___________________.
		a. Spliced
		b. Drilled
		c. Cut or notched
		d. All of the above
Engineered trusses limit your ability to route piping. Trusses that are engineered must not be cut, notched, drilled, spliced or otherwise altered. (IPC 307.5; UPC 312.2). If any alteration of a truss is essential, an engineer should be consulted to render specific instructions on what may be done to accommodate a plumbing installation. Incorrect answer. Please choose another answer.

34.	When you are installing piping in a hospital you may be required to penetrate walls that are designed for fire protection. When this is the case, you will have to seal the pipe penetrations. This can be done by filling the void around the piping with spray foam insulation.
		a. True
		b. False
False - If you will be installing piping that will penetrate a fire-rated wall, you will have to work from approved plans and specifications. These documents will detail the acceptable manner in which to seal the voids around piping. (IPC 307.4, 315; UPC 312.7, 312.10.3). Incorrect answer. Please choose another answer.

35.	One of your journeyman plumbers is being sent out to connect a building drain to a sewer. You have instructed the plumber to wait for the plumbing inspector and then after the connection is approved to cover the piping with earth. Which of the following represents the minimum depth of cover required over the crown of a buried pipe?
		a. Four inches
		b. Six inches
		c. Eight inches
		d. Twelve inches
Buried pipes are required to have a minimum depth of coverage that is equal to one foot in depth. (IPC 306.3; UPC 312.3). The material used to cover the pipe is required to be clean of anything that might damage the pipe as the backfill material is installed. You must compact the fill over the piping to avoid settling. Most plumbing contractors backfill six inches of dirt at a time. Then the dirt is compacted. Once the first level is compacted a second layer is installed and compacted. This completes the minimum requirements for backfilling a buried pipe. Incorrect answer. Please choose another answer.

36.	A project that you and your employees are working on could be subject to flooding. It involves the installation of plumbing that will be covered by a concrete slab. It is your job, as the master plumber, to design an installation that will meet code approval. Which of the following will influence your design?
		a. Hydrostatic load and stress
		b. The risk of a 100-year flood in the installation area
		c. The seismic conditions of the earth that plumbing is buried in
		d. The perk rate of the soil that plumbing is buried in
Plumbing installations in potential flood areas require special consideration. (IPC 305., 309.1; UPC 301.4). The systems must be protected in ways that will prevent damage from flooding. Protection requirements call for the consideration of hydrostatic load and stress, hydrodynamic loads and stress, flooding of the piping in the plumbing system and potential buoyancy of the piping. Incorrect answer. Please choose another answer.

37.	Assume that you have been contacted by a real estate developer who has bought a 4-unit multi-family dwelling that will be converted into professional office space. One of the office suites will house a dental facility. How could this affect your design and bid for altering the plumbing system?
		a. You will need zoning permission for the installation of medical gases
		b. The change in use will require a master plumber to be on site at all times due to the addition of a dental office.
		c. The change in use could require major alterations to existing plumbing in the structure.
		d. You will need a mechanical engineer to create the riser diagram and specification since the change of use is to a medical facility.
When a building is to undergo a change in use many factors can affect the plumbing required for the structure. You will need a permit for your work and this requires zoning approval for the work. In our example the present use is residential. It is being changed to commercial use. The fact that a dental office will exist in the building will require a variety of types of specialized plumbing that would not exist in a home. All of the existing plumbing may have to be removed and upgraded to meet current code requirements. Before you embark on plumbing for any change in use you should consult your local code enforcement office to define which elements of the existing plumbing can be kept in place and in use. Incorrect answer. Please choose another answer.

38.	You are charged with installing a building drain in a new system that will exit through a concrete foundation wall. Part of this installation will include _____________.
		a. a protective sleeve with a minimum diameter that is larger than the diameter of the building drain
		b. a protective sleeve that will have a minimum diameter equal to four inches.
		c. filling the annular space around the protective sleeve to make it watertight.
		d. Both a and c
Piping that penetrates an exterior wall is required to be provided with adequate pipe protection. (UPC 305.3; 312.10). This protection is meant to keep the pipe from being crushed. The protection is generally provided by installing a sleeve that is at least two pipe diameters larger than the pipe being installed. Additionally, the sleeve must be installed in such a way to keep the opening watertight. (IPC 305.3; UPC 312.10). Incorrect answer. Please choose another answer.

39.	Pipe protection must be provided for piping that is buried. This is typically done by installing the piping below the local frost line. Which of the following depths below the frost line would comply with the minimum requirements of the code?
		a. 1 inch
		b. 3 inches
		c. 5 inches
		d. 12 inches
The depth of frost penetration in earth varies from region to region. For example, the frost line in Maine is 4 feet. In a more southern state, the frost line could be 18 inches. Local plumbing codes define the depth of a frost line in their jurisdictions. Regardless of the depth of a frost line, plumbing pipes must be installed no less than 6 inches below the established frost line (IPC) or below 12 inches (UPC) as determined by the local plumbing code. (IPC 305.4; UPC 609.1). And, at no point is there to be less than 12 inches of ground cover over a buried pipe. Incorrect answer. Please choose another answer.

40.	Mechanical joints are an acceptable means of joining materials of different types.
		a. True
		b. False
True - Mechanical joints are a recommended means of making connections between dissimilar types of materials. (IPC 705.16; UPC 705.10). They can also be used to join like materials. Incorrect answer. Please choose another answer.

41.	If you feel that a code officer has failed an installation during an inspection for unfounded reasons, you can appeal the decision. This is a rare occasion, but there are times when an appeal is justified. When this is the case, what must you do?
		a. Make your appeal based on a technical trade manual that applies to your installation.
		b. Make your appeal based on pertinent code language.
		c. Make your appeal in the local court system.
		d. All of the above
An appeal of a code officer's decision must be based on the aspects of the code as they relate to the rejection that you are appealing. You will be required to specify why the appeal is necessary and warranted and this may involve reference to trade manuals but it is not required. In an appeal, you will essentially be arguing what is authorized under the code. Incorrect answer. Please choose another answer.

42.	What is the maximum distance allowed between pipe supports for copper DWV piping that is installed vertically?
		a. 1 foot
		b. 2 feet
		c. 4 feet
		d. 10 feet
Ten feet is the maximum distance allowed between pipe supports for copper DWV piping that is installed in a vertical position. (IPC Table 308.5; UPC Table 313.3). Incorrect answer. Please choose another answer.

43.	Piping must be protected from the effects of corrosion. This can be done in a number of ways. Assume that you are installing copper piping in a ground works installation that will be covered by concrete. The horizontal runs of the piping will be protected by the fill material used prior to concrete placement. However, when sections of the piping are turned up as stub-outs they will be in a position to have concrete poured around them. This could cause a problem with both abrasion and chemical reaction. Which of the following would be considered a suitable means of protecting these stub-outs at the point where they will be surrounded by concrete?
		a. Installing a gravel bed around the pipe
		b. Installing foam pipe insulation on the copper.
		c. Installing wooden support stakes adjacent to the stub outs
		d. Install stub outs so that they rise inside a partition wall where they can be supported.
Foam pipe insulation installed on copper risers that will be stub-outs is a suitable means of protection from contact with concrete. It is also acceptable to sleeve the copper piping or tubing with a section of plastic piping. The goal is to prevent concrete from having direct contact with the copper piping. Any form of protection that is used should be secure and durable and should not be affected adversely from direct contact with concrete. (IPC 305.1; UPC 609.3). Incorrect answer. Please choose another answer.

44.	Which of the following mediums may be used for testing cast iron DWV systems for leaks?
		a. Smoke
		b. Air
		c. Water
		d. All of the above
Water is the test medium of choice. A 10-foot head of water is required for 15 minutes. It is common for modern DWV systems to be tested with air. The minimum test pressure is required to be 5 pounds per square inch (PSI). When there is a leak that cannot be found easily, smoke can be used to expose the leak location. Smoke is not used as a primary test method. (IPC 312.2, 312.3, 312.5; UPC 712.1). Incorrect answer. Please choose another answer.

45.	The plumbing code requires that an air test on a DWV system be maintained at a minimum of 10 pounds per square inch for at least 45 minutes.
		a. True
		b. False
False - The plumbing code requires that an air test on a DWV system be maintained at a minimum of 5 pounds PSI (UPC) or 10 pounds (IPC) for at least 15 minutes. (IPC 312.3; UPC 712.3). Air tests cannot be used on plastic piping. (IPC 312.3; UPC 609.4). Incorrect answer. Please choose another answer.

46.	When underground plumbing is being tested with water there must be one riser that is at least ______feet above the main plumbing system.
		a. 1
		b. 5
		c. 10
		d. 15
When underground plumbing is being tested there must be one riser that is at least ten feet above the main plumbing system. (IPC 312.3; UPC 712.2). This riser allows for a head of pressure to build over the entire system. This applies to a water test. Incorrect answer. Please choose another answer.

47.	Can a code official establish plumbing requirements outside of the code?
		a. No, otherwise it would be arbitrary.
		b. No, the code cannot be superseded.
		c. Yes, for all plumbing matters outside the code.
		d. Yes, on matters necessary to ensure the proper operation of the plumbing system or public safety.
Any requirements necessary for the strength or proper operation of an existing or proposed plumbing system, or for the public safety, health and general welfare, not specifically covered by the plumbing code shall be determined by the code official. (IPC 104.2; UPC 103.1). Incorrect answer. Please choose another answer.

48.	Who is responsible for maintenance of a plumbing system?
		a. The master plumber
		b. The code official
		c. The property owner
		d. Occupant of the building
The maintenance of plumbing system is the responsibility of the owner. (IPC 102.3; UPC 102.3). The owner may authorize another party to be a responsible party for the property in which case that party is responsible for the maintenance of the plumbing system. Incorrect answer. Please choose another answer.

49.	What type of inspection is required during the final test of a completed vent and drainage system?
		a. Visual
		b. Paper
		c. Manual
		d. Third-party
The final test of a vent and drainage system requires a visual test for compliance to the code. (IPC 111.2; UPC 105.2). In preparation of the final drain and vent test, the plumbing fixtures must be assembled, set and sealed to the walls and floors, connected to the water supply and drainage system (if required) and fixture traps filled with liquid. The final check of the drainage and vent system is up to the discretion of the code official. Incorrect answer. Please choose another answer.

50.	Under the code, who is to carry out the certification of plumbing products?
		a. A plumbing inspector
		b. A third-party certification agency
		c. A master plumber
		d. A code committee
All products and materials are to be certified in accordance with third party certification requirements. (IPC 303.4; UPC 301.2). Incorrect answer. Please choose another answer.

51.	In a water distribution system where hot and cold is bundled, the water pipe shall be_________.
		a. installed only on vertical runs
		b. installed with CPVC pipe in a residential home only
		c. installed with copper piping only
		d. insulated from the possible hot and cold transfer of heat
All water pipe in a parallel system when the hot and cold piping is bundled the hot water pipe must be insulated to stop the possible transfer of heat. (IPC 308.9; UPC 609.12.1). This can be done by insulating the hot water pipe with an insulation jacket or pipe separation fingers. Incorrect answer. Please choose another answer.

52.	What is the rodding clearance for a cleanout on a 2" drain?
		a. 12"
		b. 18"
		c. 30"
		d. 40"
The rodding clearance on a cleanout for a 2" drain is 18". (IPC 708.1.10; UPC 707.9). Incorrect answer. Please choose another answer.

53.	You are the contractor on a commercial renovation for a hair salon. You are installing the head shampoo stations. What is the maximum water temperature for the shampoo stations?
		a. 95°
		b. 100°
		c. 120°
		d. 140°
The maximum water temperature for head shampoo stations is 120°. (IPC 412.10; UPC 417.7). Incorrect answer. Please choose another answer.

54.	A plumbing permit is good for _______ days.
		a. 45 days
		b. 60 days
		c. 180 days
		d. None of the above
Permits are authorized for 180 days and can be extended upon written request. (IPC 105.5.3; UPC 104.4.3). Incorrect answer. Please choose another answer.

55.	The reference point that is the determining factor at which a backflow preventer is installed is known as the _________.
		a. critical level
		b. installation level
		c. cross-connection
		d. None of the above
An elevation reference point or critical level that determines the minimum height at which a backflow preventer or vacuum breaker is installed above the flood level rim of the fixture or receptor served by the device. The critical level is the elevation level below which there is a potential for backflow to occur. Incorrect answer. Please choose another answer.

56.	Under what conditions can a sump pump be installed in an elevator shaft?
		a. If the building is three stories or less.
		b. When the pipe being installed is cast iron.
		c. In any situation, as long as it is vented.
		d. If it's indirectly connected to the plumbing system.
Sump pumps are permitted at the base of the shaft if they are indirectly connected to the plumbing system and comply with section on oil separators. (IPC 301.6). They will have an oil interceptor or an approved alarm system. Incorrect answer. Please choose another answer.

57.	An example of a DWV fitting used in a drainage system in a prohibitive manner is a __________.
		a. Low heel inlet ¼ bend vertically facing upward
		b. Sanitary tee with the outlet down and the bull horizontal
		c. Sanitary tee horizontal-to-horizontal
		d. Combination wye and eight bend placed on flat side
The use of a sanitary tee receiving horizontal waste into the bull of a tee and the discharge down is acceptable. The top would be a vent. The use of a sanitary tee in the horizontal-to-horizontal position is prohibited because the tee is a short sweep fitting and blockages are likely to occur. Incorrect answer. Please choose another answer.

58.	A journeyman plumber has the authority to perform all of the following plumbing work except:
		a. Rough-in a multi-family building without a Master Plumber present.
		b. Work directly for a homeowner with a homeowner's permit and receive payment for services.
		c. Install a septic system
		d. Both b and c
A journeyman plumber is not required to be under the direct supervision of a master plumber. It is a violation of the plumbing code for a journeyman plumber to work under a homeowner's permit and to receive payment, for such would require a master plumber operating as a business and obtaining the plumbing permit. Incorrect answer. Please choose another answer.

Fixtures

59.	What is the minimum number of plumbing fixtures that must be installed in a single-family residence?
		a. 3
		b. 4
		c. 5
		d. 6
The minimum number of plumbing fixtures required for a single-family home is five. This includes a toilet, a lavatory, a bathing unit, a kitchen sink and a washing machine connection. (IPC Table 403.1; UPC Table 422.1). Additional fixtures can be added, such as dishwashers and hose bibs. Incorrect answer. Please choose another answer.

60.	You are designing the plumbing system for a multi-family residence that will be a used as a rental property. If the building has _______ rental units, it is required to be equipped with at least one laundry facility.
		a. 4
		b. 6
		c. 10
		d. 20
Multi-family buildings are required to be equipped with a laundry facility when the total number of rental units reaches 20 under the IPC and 12 under the UPC. (IPC Table 403.1; UPC Table 422.1). Additional laundry hook-ups are required for each additional interval of 20 or 12 units respectively. For example, a 60-unit building would be equipped with 3 laundry facilities under the IPC and 4 under the UPC. Incorrect answer. Please choose another answer.

61.	Daycare facilities are required to offer one toilet for every _______ people accommodated in the facility.
		a. 6
		b. 8
		c. 12
		d. 15
For every 15 people housed in a daycare facility one toilet is required. (IPC Table 403.1). Depending on how a daycare is classified, it could be one toilet for up to 50 people. (UPC Table 422.1). If there were 45 people using the facility a total of three toilets would be needed. Local code requirements may require separate facilities for males and females. If this is the case, you must double the number of toilets so that there is a toilet for every 15 males and a toilet for every 15 females. Incorrect answer. Please choose another answer.

62.	In an office building, what is the maximum distance that employees can be required to walk in order to reach a restroom?
		a. 150 feet
		b. 300 feet
		c. 400 feet
		d. 500 feet
Five-hundred feet is the maximum allowable distance that employees can be required to walk in order to reach a restroom. (IPC 403.3.3; UPC 422.4). Incorrect answer. Please choose another answer.

63.	How many flights of stairs are permitted between an employee workspace and the nearest restroom?
		a. 1
		b. 2
		c. 3
		d. There is no set limit
Employees are not to ascend more than one set of steps to get to a restroom. (IPC 403.3.3; UPC 422.4.1). The plumbing facilities cannot be installed more than one story above the work area that employees will be moving from. Incorrect answer. Please choose another answer.

64.	Motel rooms are required to be equipped with _____________.
		a. Either a kitchen or bar sink
		b. A shower head
		c. Accessible plumbing fixtures
		d. A backwater valve on the building drain for the unit
Since motel rooms are used by the public, and their restrooms will be used by the public, the bathrooms must be fitted with accessible plumbing facilities. (See Public Accommodation, ADA, Title 42, Section 12182; ICC A117.1; UPC 403.2). Incorrect answer. Please choose another answer.

65.	You are working on a bid for a commercial building that will have public restrooms. Part of your job is to draw a suitable riser diagram to submit with your application for a plumbing permit. In order for you to accomplish this task you must know what the minimum fixture requirements are for each restroom. Which of the following fixtures is not allowed to be installed in a public restroom?
		a. Hose-bib connections
		b. Bidets
		c. Showers
		d. Drinking fountains
Plumbers are prohibited from installing drinking fountains in public bathrooms. (IPC 410.5; UPC 415.4). The reason for this is to protect users of the restroom from germs and diseases that might be collected on a drinking fountain that is in a toilet room. Incorrect answer. Please choose another answer.

66.	As a plumber you are aware of plumbing fixtures made for ADA compliance. As a new master plumber, you are about to determine the requirements for accessible plumbing fixtures that will be provided for public use in the restrooms of a restaurant. This will require you to outline the specifications for the bathroom. When you, or your plumbers, install the plumbing you will have to consider ____________.
		a. the requirements of both the plumbing and building codes
		b. only the requirements of the plumbing code
		c. only the requirements of the building code
		d. the plumbing and mechanical code
You will have to abide by both the plumbing and building codes when you are installing accessible plumbing fixtures. Requirements for fixture types, heights and placements will be identified in the plumbing code. The building code will dictate the access requirements, such as door widths. To design your plumbing system for accessible plumbing fixtures you will rely on both the building and plumbing codes and use them together in the overall design of your plumbing system. Incorrect answer. Please choose another answer.

67.	Which of the following standards sets forth the requirements for accessible plumbing facilities for persons with physical disabilities?
		a. IPSCD
		b. ICC A117.1
		c. IFGC
		d. NFPA 70
The ICC A117.1 is the standard for accessible and usable buildings and facilities under both the IPC and UPC. (IPC 404.2; UPC 403.2). Incorrect answer. Please choose another answer.

68.	You are designing a plumbing plan for the construction of a new hospital. This is a major task. It is often done by a mechanical engineer, but the general contractor has asked you to develop a working plan. Your plan begins at the municipal piping and includes all interior plumbing. You will have to provide at least two water mains for the hospital.
		a. True
		b. False
False - The plumbing code requires that all hospitals be provided with at least two water services. But it allows for the use of a single water main. (IPC 609.2; UPC 1303.8). This means that one water main can be connected to two water services in order to provide water to a hospital. Incorrect answer. Please choose another answer.

69.	What is the minimum allowable height for a handicap toilet?
		a. 14 inches
		b. 17 inches
		c. 20 inches
		d. 22 inches
Handicap toilets are required to have a minimum height of 17 inches. (ICC A-117.1, 604.4). The most common accessible toilets have a height of 18 inches. In extreme cases, you can obtain and install a toilet that enjoys a height of 20 inches. Eighteen inches is the most common height of a standard handicap toilet. Incorrect answer. Please choose another answer.

70.	Which of the following describes a specific type of toilet?
		a. Siphon jet
		b. Non-siphoning
		c. Fast flushing
		d. Internal injected
There is a type of toilet known as a siphon jet toilet. It is one of many types of toilets. Other types include: siphon vortex, siphon wash, reverse trap, and blowout toilets. All of these toilets are approved for use under the control of the plumbing code. Incorrect answer. Please choose another answer.

71.	The minimum distance required in front of an accessible lavatory is __________.
		a. 12 inches
		b. 16 inches
		c. 22 inches
		d. 30 inches
The minimum distance required in front of an accessible lavatory is 30 inches. (ICC A 117.1, 305.3). Accessible lavatories must also allow easy access by a person in a wheelchair. Typical designs for spacing in front of a lavatory include an area that is 30 inches by 30 inches. Incorrect answer. Please choose another answer.

72.	Accessible lavatories are required to be installed so that the distance from a finished floor to the top of a lavatory is no more than ______ inches.
		a. 18
		b. 24
		c. 34
		d. 42
Accessible lavatories are to be installed so that the top of the lavatory is never more than 34 inches above the finished floor beneath the lavatory. (ICC A117.1, 606.3). The measurement is made from the flood-level rim of the fixture to the finished floor. Incorrect answer. Please choose another answer.

73.	Kitchen sinks that are installed for accessible use are not to be installed higher than ______ inches above the finished floor.
		a. 28 inches
		b. 30 inches
		c. 34 inches
		d. 42 inches
Kitchen sinks installed for accessible use cannot be installed more than 34 inches from the finished floor. (ICC A117.1, 606.3). The measurement is made from the flood-level rim to the finished floor. The primary responsibility for counter height falls upon the building contractor and carpenters. Even so, if you install a sink in a counter that is not set within the regulatory guidelines of the building and plumbing codes you can count on having to remove that sink and reinstall it when the counter height is corrected. Incorrect answer. Please choose another answer.

74.	You are installing accessible plumbing fixtures. You had journeyman plumbers set the fixtures and you review the work prior to calling for a code enforcement inspection. Visually, something looks wrong to you. Your concern is that the faucets on the lavatories will be difficult to reach for disabled people. Using your tape measure, you check the distance from the front of the lavatory. What is the maximum distance that a lavatory faucet for accessible use can be placed from the front edge of a lavatory?
		a. 18 inches
		b. 22 inches
		c. 24 inches
		d. 25 inches
Twenty-five inches is the maximum distance allowed between the front edge of a lavatory and the faucet installed on it when the fixture is to be rated as an accessible fixture. (ICC A117.1, 308.2.2). Incorrect answer. Please choose another answer.

75.	What is the maximum pressure allowed to operate a handle on a handicap faucet?
		a. 40 PSI
		b. 60 PSI
		c. 3 pounds of force
		d. 5 pounds of force
Handicap faucets are required to be designed so that they will operate with a maximum operational force of five pounds. (ICC A117.1, 309.4). It is expected that users of these faucets may be limited in their strength and ability to move faucet handles. This is the reason for the light pressure requirements. Incorrect answer. Please choose another answer.

76.	Which of the following types of faucet handles are not allowed for use with faucets that will be installed on accessible fixtures?
		a. Blade handles
		b. Crossbar handles
		c. Push-button handles
		d. Wing handles
Crossbar handles are not allowed for use in conjunction with accessible faucets. (ICC A117.1, 404.4.6). The types of handles that are allowed include: push-button handles, sensor-units, blade handles, wing handles and single handles. The reason for this is that finger dexterity is not a requirement for operating the handles. Incorrect answer. Please choose another answer.

77.	Accessible bathtub installations require ____________.
		a. A trip-lever tub waste
		b. A twist-and-turn tub waste
		c. Grab bars
		d. A single-handle faucet
Grab bars are required to be installed for all bathtubs that are installed for accessible use. (ICC A117.1, 607.4). These bars are required to have a minimum diameter of 1.25 inches. The diameter cannot exceed 2 inches. The bars are required to be at least 24 inches in length and installed horizontally. Incorrect answer. Please choose another answer.

78.	Hoses for personal shower units in a handicap bathing unit are required to have a minimum length of __________.
		a. 4 feet
		b. 5 feet
		c. 6 feet
		d. 8 feet
A minimum length of five feet is required for hoses installed on personal shower units in handicap bathing units. (ICC A117.1, 607.6). The hose must be long enough to allow bathers to use it from seats in bathing units and from wheelchairs. Incorrect answer. Please choose another answer.

79.	Assume that you are discussing building plans with a general contractor. You have been asked to review preliminary building plans to see if any changes may be needed to keep the plans in compliance with the requirements of the plumbing code. You look at the proposed bathroom locations and notice a problem. In one situation, the accessible travel route for people going to use the public restroom passes through a storage room. This is a code violation.
		a. True
		b. False
True - Public restroom facilities must have accessible travel routes that do not go through kitchens, storage rooms or closets. (IPC 403.3.1; UPC 422.4.1). Incorrect answer. Please choose another answer.

80.	Seats in showers used for accessible purposes are not allowed to be wider than _________ inches from the seat wall.
		a. 16 inches
		b. 18 inches
		c. 20 inches
		d. 24 inches
An accessible shower that contains a seat must be provided with a seat that is not more than 16 inches in length from the seat wall. (ICC A117.1, 610.3.1). Permanent seats have to be mounted along a sidewall of the shower and run the full length of the shower. Incorrect answer. Please choose another answer.

81.	Seats in showers used for accessible purposes must have a height that is within which of the following ranges measured from a finished floor?
		a. 16 to 17 inches
		b. 17 to 19 inches
		c. 17 to 24 inches
		d. No set limit
There is a height requirement to be observed in an accessible use situation. The seat is to have a height that is not less than 17 inches and not more than 19 inches from the finished floor. (ICC A117.1, 610.2). Incorrect answer. Please choose another answer.

82.	You are researching where a push button on a public drinking fountain can be mounted based on a reach range. Which code section ultimately will give the reach ranges for the height of the push button on the drinking fountain?
		a. ICC A117.1 602.3.1
		b. ICC A117.1 309.3
		c. ICC A117.1 308
		d. None of the above.
The code citation for Drinking Fountains, Operable Parts, ICC A117.1 602.3.1, refers the plumber to section 309.3 for the height of the operable parts. This sections then refers the plumber to section 308, where the reach ranges are set forth. Incorrect answer. Please choose another answer.

83.	How many inches of clearance are required on each side of a bidet when measured from the center of the drain?
		a. 12 inches
		b. 15 inches
		c. 18 inches
		d. 30 inches
Bidets are required to have a minimum of 30 inches of clear space for a suitable installation. This requires a minimum of 15 inches of clearance on both sides of the bidet from the center of the drain opening. (IPC 405.3.1; UPC 402.5). Incorrect answer. Please choose another answer.

84.	Plumbing fixtures are required to be installed __________.
		a. level and with good workmanship
		b. in new condition
		c. only by licensed plumbers
		d. with stop valves within six inches of the fixture
Plumbing fixtures are required to be installed level and with good workmanship. (IPC 405.3; UPC 309.4, 402.5). Code officers are allowed to reject plumbing work that is not done with good workmanship principles. When speaking in terms of being level, this refers to both a left-to-right position and a front-to-back position. Incorrect answer. Please choose another answer.

85.	Closet bolts should be constructed of _________.
		a. Black iron
		b. Copper
		c. Galvanized steel
		d. Brass
Closet bolts should be constructed of brass. This is the industry standard. The bolts that hold a toilet to a flange or floor are required to be resistant to corrosive action. (IPC 405.4; UPC 402.6). When they are not, they can weaken and allow a toilet to move over time and with usage. Brass lag bolts should be used to secure toilets to floors when no closet flange is installed. Incorrect answer. Please choose another answer.

86.	How many inches of open space is required, at a minimum, for ingress and egress when a shower door is open?
		a. 22
		b. 28
		c. 30
		d. 32
All shower doors are required to allow for a minimum unobstructed opening of ingress and egress of not less than 22 inches. (IPC 421.4.2; UPC 408.6). Incorrect answer. Please choose another answer.

87.	The maximum travel length allowed to reach a unisex toilet facility in a shopping mall is 300 feet.
		a. True
		b. False
True - Three-hundred feet is the maximum travel distance allowed for the public to reach a unisex toilet facility. (IPC 403.3.4; UPC 422.4). The 300 feet is measured from the entry of any store in the shopping mall to the toilet facility. Unisex restrooms are not allowed to be located more than one story above or below a separate-sex restroom. A five-hundred feet maximum is the distance for structures other than shopping malls or centers. (IPC 403.3.3; UPC 422.4). Incorrect answer. Please choose another answer.

88.	While bidding a job, you study all of the plans and specifications. The specs call for anti-scald shower valves to be installed throughout the bathrooms in the building. Knowing this, you will tell your plumbers to install shower valves that are of a __________ type.
		a. Temperature actuated flow reduction
		b. Pressure-balanced
		c. Pressure-reducing
		d. Metering
The reason for a pressure-balanced valve is to protect people from unexpected changes in water temperatures. It is bad enough when a warm shower shifts to cold water as some other fixture is used in the system. But it can be far worse if extreme hot water is expelled quickly and without warning. Infants and elderly people may not be able to move quickly enough to avoid pain and possible skin damage from unchecked hot water. Temperature actuated flow reduction valves are not a suitable replacement for a balanced pressure valve. Incorrect answer. Please choose another answer.

89.	What type of closing device is allowed for use on a bathtub drain?
		a. Plunger stoppers
		b. Rubber stoppers
		c. Lift-and-turn stoppers
		d. All of the above
Bathtubs are required to have a waste outlet with a stopper. (IPC 407.2; UPC 409.2). Many types of devices are allowed to function as a stopper. They include all of the following: plunger stoppers, rubber stoppers, lift-and-turn stoppers, push-pull stoppers and snap-down-pop-up stoppers. Incorrect answer. Please choose another answer.

90.	When is an access panel required for a tub waste and overflow?
		a. When the tub waste is sealed with solvent-weld joints
		b. When the tub waste is sealed with soldered joints
		c. When tub wastes are sealed with slip nuts and washers
		d. When tub wastes are sealed with non-mechanical connections
A tub waste and overflow that is installed with the use of slip nuts and washers requires an access panel. (IPC 405.9; UPC 402.10). This is necessary for any required service to the tub waste. The use of solid, permanent connections for tub wastes eliminates the need for access panels. Solvent-weld joints and soldered joints are examples of such connections. Incorrect answer. Please choose another answer.

91.	Which of the following is required with the installation of a dishwasher?
		a. A copper water supply
		b. A Schedule-40 drain from the appliance to the sanitary drainage system that is vented
		c. An air gap
		d. A safety pan under the appliance to collect any condensation
Dishwashers are required to discharge their waste through an air gap. (IPC 802.1, 802.3; UPC 801.2, 807.1). The reason for this is to eliminate the possibility of back siphonage. One alternative is to install a backflow preventer on the drainage line, but this is extremely rare. Air gaps are normally installed on the deck of a kitchen sink, but they can be installed on a kitchen counter. Incorrect answer. Please choose another answer.

92.	Washing machines are required to discharge their waste into _____________.
		a. An indirect-waste receptor
		b. A special waste receptor
		c. A gray-water recycling collection tank
		d. A pump-assisted sump
The drain from a washing machine is required to discharge into an indirect waste receptor. (IPC 406.2; UPC 804.1, 1001.2). Incorrect answer. Please choose another answer.

93.	A residential garbage disposer requires a drain that has a minimum diameter of ______.
		a. 7/8 of an inch
		b. 1 inch
		c. 1.5 inches
		d. 2 inches
Garbage disposers are required to discharge into drains that have a minimum diameter 1.5 inches. (IPC 416.2; UPC Table 702.1). All drainage connections for garbage disposers are required to be solid connections. These fixtures require their waste to be trapped. It is acceptable to connect the waste from garbage disposers to the waste system of a kitchen sink. When this is the case, the trap for the kitchen sink also serves as the trap for the garbage disposer. Incorrect answer. Please choose another answer.

94.	You are installing new plumbing for a handicap tub-shower combination. Since this is an installation of an accessible fixture, grab bars must be installed. The grab bar nearest the faucet must be installed between the faucet and the flood-level rim of the bathtub to allow people to pull themselves up from a sitting position.
		a. True
		b. False
False - You cannot install grab bars below faucets in bathing units. Controls must be installed between the flood rim of the tub and the grab bar. (ICC A117.1 607.5). The specifications for all required grab bars, their minimum dimensions and their placement can be found in the plumbing code. Incorrect answer. Please choose another answer.

95.	Floor drains must discharge into a drain pipe that has a minimum diameter of ______ inches.
		a. 1.5
		b. 2
		c. 3
		d. 4
The minimum allowable diameter for a drain pipe that receives the waste from a floor drain is two inches. (IPC Table 710.1; UPC 717.1). Floor drains are to be trapped and vented. Each floor drain is required to be fitted with a removable strainer. The strainers are required to be readily accessible. Incorrect answer. Please choose another answer.

96.	Which of the following drain pipe sizes meets the requirements for a shower drain?
		a. 1 inch
		b. 1.25 inches
		c. 2 inches
		d. Either b or c
A 2" waste outlet for a shower meets the minimum requirements of the IPC (1.5") and the UPC (2"). (IPC 421.3; UPC 408.5). Removable strainers are required to cover the shower drain within the shower base. At no time can the diameter of the drain be reduced in its run towards a building sewer. Incorrect answer. Please choose another answer.

97.	Which of the following is a code requirement for ballcock assemblies used in residential toilets?
		a. Anti-siphon construction
		b. Brass construction
		c. Metallic construction
		d. Siphonic construction
Anti-siphon construction is a requirement for all ballcock assemblies that are installed in toilets for residential use. (IPC 415.3.1; UPC 413.3). Older style ballcocks remain on the open market but they are not approved for use. Even if you are doing service and repair work, you must install only anti-siphon devices. Incorrect answer. Please choose another answer.

98.	A plumber is installing a commercial garbage disposer. Which of the following drain sizes will meet code?
		a. 1 inch
		b. 1.25 inches
		c. 2 inches
		d. None of the above.
By the code, a minimum diameter of a drain pipe for commercial garbage disposers is 1.5 inches for the IPC and 2 inches for the UPC. (IPC 416.3; UPC Table 702.1). Many plumbers will use no smaller than 2 inches. They require their own drainage piping and trap. Do not confuse the code regulations for residential garbage disposers with the requirement for commercial garbage disposers. A cold-water source must be available to the disposer. The water source can be of an automatic type. Commercial garbage disposals are not allowed to be connected to grease interceptors. Incorrect answer. Please choose another answer.

99.	Commercial garbage disposals may be connected to grease interceptors.
		a. True
		b. False
False - It is common for grease traps to be installed in commercial kitchens. Do not let this fool you. Commercial garbage disposals must not be connected to grease interceptors. (IPC 1003.3.2; UPC 1014.13). Incorrect answer. Please choose another answer.

100.	A water supply is needed for the installation of garbage can washers. What else is required when these devices are installed?
		a. A special vent
		b. An air gap
		c. A local vent
		d. An aerator
Backflow protection must be installed on the water supply lines for garbage can washers. (IPC 417; UPC 603.5.19). An air gap is the right choice of the answers given. Due to the nature of the use of these devices the risk of backflow into a potable water source is not acceptable. You must ensure that the water supply will not be at risk of siphoning dirty water into the potable water distribution system. A vacuum breaker could also be used. Incorrect answer. Please choose another answer.

101.	Urinals using water are required to be served by _____________.
		a. A water service that is equipped with a pressure-reducing valve
		b. A water service that is not equipped with a pressure-reducing valve
		c. A single flush valve
		d. A single ballcock
A urinal that uses water is required to be served by a single flush valve. (IPC 415.1; UPC 413.1). The valve must be of an approved type and may be handle or sensor operated. Incorrect answer. Please choose another answer.

102.	Bedpan washers are also known as __________.
		a. Service sinks
		b. Garbage-can washers
		c. Clinical sinks
		d. Local-vent sinks
Bedpan washers are also known as clinical sinks. It is common for the flush-valve piping to water closets to contain piping that is designed to be activated as a bedpan washer. This reduces the need for a separate fixture in healthcare facilities. Incorrect answer. Please choose another answer.

103.	What requirements do plumbing devices have to meet in order to be considered readily accessible?
		a. The devices are allowed to be installed behind removable access panels.
		b. The devices must be installed in such a way that nothing is required to be moved or removed to work on the device.
		c. The devices must be installed with mechanical joints.
		d. M The devices must not be installed in a crawl space.
When a plumbing device is required to be readily accessible it must be able to be worked on without having to move or remove anything. For example, a pressure-reducing valve that is installed on a water distribution pipe near the connection to a water service in an unfinished basement where the valve can be seen and touched is installed in a readily accessible way. Incorrect answer. Please choose another answer.

104.	The minimum height above a flood-level rim of a fixture for an atmospheric vacuum breaker to be installed is ________ inches.
		a. 6
		b. 12
		c. 18
		d. 20
When a backflow preventer is installed to protect a fixture the backflow device is required to be installed a minimum of six inches above the flood-level rim of the fixture. (IPC 608.16.4; UPC 603.5.1). This can become confusing when working with showers. Handheld shower devices that have backflow preventers installed must have them installed a minimum of six inches above the highest point to which the handheld shower can be raised. Incorrect answer. Please choose another answer.

105.	Drinking fountains installed in public restrooms require a minimum distance of 15 inches from the side of the fountain to the center of a toilet.
		a. True
		b. False
False - Drinking fountains are not allowed to be installed in rooms where toilet facilities exist. (IPC 410.5; UPC 415.4). This is for sanitation purposes. While it is true that toilets require a minimum of 15 inches from the center of the toilet drain to the closest fixture is true. But, the fact that drinking fountains are not allowed to be installed in toilet rooms makes the statement false. Incorrect answer. Please choose another answer.

106.	Which of the following is NOT a code requirement for plumbing fixture installation?
		a. Make the fixture accessible for cleaning and repair
		b. Caulking of all fixtures to prevent germs from growing under the fixture space.
		c. Meet ADA height requirements for the disabled
		d. Use ridged piping on all connections.
Plumbing fixtures must be installed in such a way that they offer easy access for cleaning and repair regarding both the fixture and the area around the fixture. All fixtures must be caulked to prevent germ and mold growth. All ADA fixtures must be installed for accessibility height for use. The code does not require the use of ridged piping on all connections. Incorrect answer. Please choose another answer.

107.	You are installing public drinking fountains in a commercial office building that is 4 stories in height. All of the floors have office space. Based on the number of stories, what is the minimum number of public drinking fountains needed?
		a. 1
		b. 2
		c. 3
		d. 4
Public drinking fountains cannot be more than one story above or below the tenant space and must be on an accessible route. (IPC 403.5). Based on the number of stories in this scenario, at least 2 public fountains would be needed. Under the IPC and UPC, additional fountains may be needed based on the size of the tenant space and number of people using the space. (IPC Table 403.1; UPC Table 422.1). Incorrect answer. Please choose another answer.

108.	A small single-story office building is being renovated. The occupant load is no more than 15 people. How many drinking fountains are needed?
		a. 3
		b. 2
		c. 1
		d. 0
When a building has a building load of 15 or less (IPC) or 30 or less (UPC), drinking fountains are not required. (IPC 410.2; UPC 415.2) Incorrect answer. Please choose another answer.

109.	How close to a side wall can the center line of a toilet fixture be installed?
		a. 12''
		b. 15''
		c. 18''
		d. 21''
No toilet or bidet fixture can be set closer than 15 inches from its center to any side wall, partition, vanity or other obstructions. (IPC 405.3.1; UPC 402.5). Incorrect answer. Please choose another answer.

110.	A shower compartment floor shall be able to encompass a ______ inch circle.
		a. 20
		b. 25
		c. 30
		d. 40
The 30" minimum dimension is based on the movement of the body while cleaning oneself. (IPC 421.4; UPC 408.7). Shower compartments must have a minimum of 900 square inches (IPC) or 1024 square inches (UPC) of interior cross- sectional area. A smaller size shower would not provide adequate space. Incorrect answer. Please choose another answer.

111.	In what application is tempered or tepid water used?
		a. In residential hot water use
		b. In commercial kitchen prep areas
		c. In hotel hot water use
		d. All of the above
Tempered or tepid water is delivered with a temperature ranging from 85 to 110 degrees in a hot water system. (IPC Definitions; UPC Appendix N). Incorrect answer. Please choose another answer.

112.	What temperature is hot water under the code?
		a. 85 degrees
		b. 100 degrees
		c. 120 degrees
		d. All of the above
Hot water is defined under the IPC as being over 110 degrees and under the UPC as being 120 to 130 degrees. (IPC Definitions; UPC Definitions and Appendix N). When hot water comes in contact with the people, precautions must be taken to protect the user from scalding. Water between 85 to 110 degrees is considered tempered or tepid water. Incorrect answer. Please choose another answer.

113.	Where should the pump for a whirlpool bath tub be located?
		a. Under the bathtub
		b. Above the weir of the trap
		c. In a closet behind the bathtub
		d. The code does not address the location of pump.
Whirlpool bathtub pumps are to be located above the weir of the fixture trap. (IPC 426.2; UPC 409.6). Sometimes they are located in a separate room or in the step into the whirlpool tub. Incorrect answer. Please choose another answer.

114.	What is the minimum size waste outlet for a sink?
		a. 1-1/4 ''
		b. 1-1/2 ''
		c. 2''
		d. 3''
Sinks must be provided with a waste outlet at a minimum of a 1 ½ inches in diameter. (UPC 422.2; UPC 420.4). This is based on 7.5 gallons per minute flow through the fixture or through the drain. Incorrect answer. Please choose another answer.

115.	What does the term "accessible" mean in a plumbing system?
		a. That pipes must be entered through a marked opening
		b. That a fixture may be removed to get into a drain system
		c. To have access to a pipe or fixture without moving anything
		d. None of the above
The term "accessible" means that which enables a fixture, appliance, or equipment to be reached by ready access or by means that may first require the removal or movement of a panel, door or similar obstruction. (IPC Definitions; UPC Definitions). Incorrect answer. Please choose another answer.

116.	What size drain line is required for a domestic food waste grinder (disposal)?
		a. 1-1/4 inches
		b. 1-1/2 inches
		c. 2 inches
		d. 3 inches
Grinders shall not be connected to a drain less than 1 ½ inches in diameter. (IPC 416.2; UPC Table 702.1). Residential food disposals must be installed with the same size drain that comes out of the wall, which is 1 ½ inches per the plumbing code. In commercial units the drain size 2, 3 and 4 inch will dictate the size of the drain for the disposal, as well as, the drain pipe discharge from the disposal. Incorrect answer. Please choose another answer.

117.	You are installing a urinal. How much water is required to flush it?
		a. .5 gallons
		b. 1 gallon
		c. 1.25 gallons
		d. 2 gallons
One gallon is the amount of water required to adequately clear a urinal. (IPC Table 604.4; UPC 412.1). Incorrect answer. Please choose another answer.

118.	To control the maximum water temperature on a public lavatory, which of the following is not permissible by code?
		a. Tempering valve
		b. Point of use instant water heater
		c. Thermostat on main water heater
		d. Both a and c
The main water heater thermostat is not considered a control for meeting the provision of the code. Incorrect answer. Please choose another answer.

119.	Because domestic clothes washer manufacturers are no longer required to comply with ASSE 1007, many plumbing inspectors require a(n) _______________________ on the water connections to the washer.
		a. internal air gap
		b. backflow preventer
		c. air break
		d. vacuum breaker
ASSE 1007 required domestic clothes washers to contain an internal air gap on the machine but manufacturers quit complying with ASSE 1007 when the requirement was dropped in 2012. It was virtually unenforceable since inspectors were unable to visually inspect the appliance without disassembly. This leads code officials to require the machine water connections to have backflow preventors to comply with the code. (IPC 406.1; UPC 402.7). Incorrect answer. Please choose another answer.

120.	You are determining the minimum number of fixtures needed in a building renovation based on the occupant load. How should the occupant load be divided to account for men and women?
		a. 75% men/25% women
		b. 50% men/50% women
		c. 25% men/75" women
		d. No account of the men/woman breakdown is necessary.
In a determination of the minimum amount of fixtures needed based on the occupant load, the occupant load is to be is to be divided in half to account for men and women. (IPC 403.1.1; UPC 422.1.1). Incorrect answer. Please choose another answer.

Indirect and Special Wastes

121.	What type of connection is required when a clothes washing machine discharges into a sanitary drainage system?
		a. An indirect waste
		b. An air break
		c. An air gap
		d. Both a and b
The drain from a washing machine is required to discharge through an air break into an indirect waste receptor. (IPC 406.2; UPC 804.1, 1001.2). It is never allowable to make a direct connection between the drain for a washing machine and a sanitary drainage system. The receptor for the indirect waste is required to have a minimum height of 18 inches and a maximum height of 30 inches (UPC) or 42 inches (IPC). (IPC 802.4.3; UPC 804.1). A drain used to receive the discharge from a washing machine is required to be trapped and vented. The minimum diameter of a trap allowed for this purpose is two inches. Incorrect answer. Please choose another answer.

122.	Assume that you are working with an indirect waste receptor. It is up to you to determine if a trap is needed and where it should be placed. Normally this type of drain is required to be trapped and vented. If an indirect waste connection runs ______, it must be trapped.
		a. 1'
		b. 2'
		c. 5'
		d. None of the above.
Standard practice is to trap the drain of an indirect waste if the drainage pipe will extend more than five feet in length. (UPC 803.3). The IPC requires a trap on indirect waste piping that exceeds 30 inches of developed length or 54 inches of total developed length. (IPC 802.3). No vent is usually required for the indirect drain. Check your local rules and regulations to be certain on this point. In other cases, a simple floor drain can serve as a receptor, but the drain must be trapped and a vent is normally required for this trap. Incorrect answer. Please choose another answer.

123.	You are bidding a job that will have special wastes included in the plumbing. In the process of working up your bid you find something that bothers you. The requested drainage plan has the special wastes using the same drainage system as the sanitary drainage fixture. Drainage systems for special wastes are not allowed to be combined with drainage systems used for sanitary drainage.
		a. True
		b. False
True - Structures are not allowed to have combined systems that convey both sanitary drainage and special wastes. (IPC 803.2; UPC 811.1). The special waste must be treated before it can be introduced into a sanitary drainage system. Incorrect answer. Please choose another answer.

124.	Assume that a general contractor for a healthcare facility has contacted you to produce a bid for plumbing a new addition on the facility. The contractor has asked you to spec your price based on the most positive form of indirect waste connections when such connections are needed. Which of the following would you choose to be the most positive means of protection when using an indirect waste?
		a. Air break
		b. Air gap
		c. Crown-vented trap
		d. None of the above
The most positive protection from back siphonage when working with indirect wastes is an air gap. Making a connection through an air gap allows open air space between the discharge pipe and the receptor receiving that waste. Since the two piping elements do not come into contact with each other backflow is essentially impossible. Incorrect answer. Please choose another answer.

125.	An indirect waste line that has a diameter of 3/4" is draining into a floor sink. What size air gap should be used between the end of the indirect drain line to the floor sink's flood rim?
		a. 3/4"
		b. 1"
		c. 1-1/2"
		d. 2"
The air gap between indirect waste piping and the flood level rim of a waste receptor should be at least twice the effective opening of the indirect waste pipe. (IPC 802.3.1). The size of an air gap on indirect waste piping should not go below 1". (UPC 802.1). Incorrect answer. Please choose another answer.

126.	Discharge tubing connected to a relief valve does not require traps for which of the following?
		a. A water heater
		b. A boiler
		c. An expansion tank that serves a boiler
		d. All of the above
The discharge tubing that is connected to a relief valve that is servicing a water heater, boiler or an expansion tank for a boiler is not allowed to be trapped. (IPC 504.6). Discharge piping from the relief valve is to extend downward to a point within six inches of a floor. Ideally, the drainage tubing should terminate above a floor drain, but this is not a requirement. The end of the tubing is not to be threaded. Incorrect answer. Please choose another answer.

127.	The drain hose from a fixture to an air break must penetrate into the receptor of the air break to a point that extends a minimum of two inches into the trap seal that serves the receptor.
		a. True
		b. False
False - At no time should the drain hose enter the trap seal. (IPC 802.3.2). Normally this hose will terminate within the first few inches of the standpipe receptor pipe. The whole point of the indirect waste is to keep the drain hose away from the water in the drainage system. Incorrect answer. Please choose another answer.

128.	You are installing plumbing for an automatic clothes washing machine. You will install a two-inch drain. It will be trapped and vented. The vent can have a minimum diameter of 1.5 inches. What is the minimum allowable height of the standpipe for the receptor?
		a. 12 inches
		b. 14 inches
		c. 18 inches
		d. 30 inches
The minimum allowable height for a standpipe on a washing machine receptor is 18 inches. (IPC 802.4.3; UPC 804.1). Standpipes for this type of installation cannot extend more than 42 inches (IPC) or 30 inches (UPC). The measurement is made from the trap seal, not the top of the trap. Receptors must be accessible. Incorrect answer. Please choose another answer.

129.	The minimum diameter for a standpipe that receives the waste from an automatic clothes washing machine must have a minimum diameter of two inches. The drains for these standpipes are required to travel their developed length in their full diameter and enter into a drainage branch or stack that has a minimum diameter of ______. The vent for a washing machine standpipe can be as small as 1.5 inches in diameter.
		a. 2 inches
		b. 3 inches
		c. 4 inches
		d. Either b or c
A drain that collects and conveys waste from a clothes washing machine is required to have a minimum diameter of three inches. (IPC 406.2). Pipe with a 2-inch diameter can convey the waste from the trapped receptor at the washing machine to the branch drain or drain stack where it terminates. It is acceptable to have the drain discharge into a larger branch drain or drain stack. Incorrect answer. Please choose another answer.

130.	Wye-branch fittings are not approved fittings to accept the waste from an air gap for a domestic dishwasher when the wye-branch fitting is installed in the waste piping above a trap for a kitchen sink.
		a. True
		b. False
False - Wye-branch fittings are an approved means of connection for the waste hose from an air gap for a dishwasher to a sanitary drainage system. (IPC 409.4; UPC 414.3). The fitting is installed as a part of the waste system for a kitchen sink prior to the waste system entering the drainage trap. Incorrect answer. Please choose another answer.

131.	You are in charge of a rough-in installation. The specifications given to you indicate the need for an indirect waste receptor. Upon further reflection, you notice a code violation in the specifications. The specs call for a fixture that is not normally allowed in a room with an indirect waster receptor. You are going to investigate this with the person who created the specifications. What type of fixture is it that you are questioning?
		a. Floor drain
		b. Food preparation equipment
		c. Toilet
		d. Kitchen sink
Indirect wastes are not normally allowed to be installed in rooms that contain toilets. (UPC 804.1). Of course, code officers can issue variances. The only common exception is the installation of an indirect waste receptor for an automatic clothes washer. When you see an indirect waster called for in a room where a toilet will be installed you should verify the clearance for the work to be done. Incorrect answer. Please choose another answer.

132.	Assume that you are to install a floor drain in a walk-in refrigerator or freezer in a restaurant. You are operating under normal code requirements. The drainage system is not going to be equipped with a backwater valve. This means that the floor drains must enter the sanitary drainage system through the use of air gaps.
		a. True
		b. False
True - When backwater valves are not installed, floor drains in this scenario are required to discharge through air gaps. (IPC 802.1.1; UPC 418, 801.2). If the floor area that contains the drains is of an impervious type it may be allowed to avoid air gaps by raising the hub of the pipe at least one inch above the floor. However, this can create a tripping hazard. For this reason, most contractors and plumbers install the drains flush with the finished floor and discharge them through air gaps. Incorrect answer. Please choose another answer.

133.	A multiple-compartment sink composed of three wells in a restaurant needs how man indirect waste pipes?
		a. 1
		b. 2
		c. 3
		d. None
Each well of a multiple-compartment sink needs to discharge independently to a waste receptor. (IPC 802.1.1; UPC 801.3.3). If there are three wells, each well needs an indirect waste pipe to discharge into a floor drain. Incorrect answer. Please choose another answer.

134.	You are installing indirect piping to kitchen equipment in a restaurant. A unit has a 1-inch drain. Which of the following sizes of indirect piping can you use?
		a. 1/2"
		b. 3/4"
		c. 1"
		d. No minimum size
The minimum size pipe for indirect piping should not be less than the drain size on the unit and, in no case, under a 1/2". (IPC 704.2; UPC 803.3). Incorrect answer. Please choose another answer.

135.	What is the maximum allowable water temperature that can be used with a commercial dishwashing machine?
		a. 115 degrees F.
		b. 120 degrees F.
		c. 140 degrees F.
		d. None of the above
Commercial dishwashing machines are allowed to use high-temperature hot water that would not be allowed for a residential use. It is common for these machines to use hot water that has a temperature in excess of 140 degrees F. (IPC 702.5; UPC 810.1). 165 degrees F is what is needed to sanitize 99.9% of bacteria according to NSF 3. Due to the high temperature of hot water used with commercial equipment the discharge from the dishwasher must discharge through either an air gap or an air break. The discharge is to enter a standpipe made of approved materials for the high-temperature water. Incorrect answer. Please choose another answer.

136.	Plumbing special wastes are generally associated with _________.
		a. Hospitals and healthcare facilities
		b. Industrial installations
		c. Structures where strong chemicals pass through piping
		d. All the above
Hospitals, healthcare facilities and structures that contain piping that conveys strong chemicals can all require plumbing for special wastes. Industrial installations also have storage areas requiring special wastes neutralization. If the waste may have a harmful effect on a plumbing or waste disposal system, it should be piped as a special waste. It is common for special waste to be neutralized, diluted or otherwise treated before it can be allowed to enter a sanitary drainage system. Incorrect answer. Please choose another answer.

137.	Clear water waste from a potable source is required to be piped to an indirect waste through a vacuum breaker.
		a. True
		b. False
False - All waste of a clear-water type from a potable source is required to be piped through an air gap, not a vacuum breaker. (IPC 802.1, 802.3; UPC 801.2, 812.1). Incorrect answer. Please choose another answer.

138.	Can steam pipes be connected to a commercial plumbing drainage system if the steam water is 212 degrees?
		a. Yes, if cast iron pipe is used
		b. Yes, if piping is installed underground
		c. Yes, if installed in a commercial kitchen without a dilution tank
		d. No.
Steam pipes cannot connect to a plumbing system with a water temperature above 140 degrees. (IPC 702.5; UPC 810.1). The IPC allows a plumbing system to handle wastewater with temperatures above 140 degrees if special piping is used that is rated for the temperature of the water to be handled. Incorrect answer. Please choose another answer.

139.	How should floor drains for walk in coolers be connected to the drainage system?
		a. Directly to the drain system
		b. To the storm drain only
		c. By use of an indirect drainage to a sanitary sewer system
		d. Without the use of a trap
Floor drains located within walk-in refrigerators or freezers in food service and food establishments are to be indirectly connected to the sanitary drainage system by means of an air gap. (IPC 802.1.2; UPC 801.3.3). Incorrect answer. Please choose another answer.

140.	An oil separator is installed when __________________.
		a. cars are serviced, greased, repaired, washed, or where gasoline is dispensed
		b. residential garage for 2 cars
		c. connected to a storm sewer only
		d. a parking lot is used for storage of more than 25 cars
Where automobiles are serviced, greased, repaired or washed, or where gasoline is dispensed, oil separators are to be installed to receive the discharge before emptying into the building drainage system or other point of disposal. (IPC 1003.4; UPC 1017.1). Incorrect answer. Please choose another answer.

141.	A drainage pipe with a diameter of three quarters of an inch can be used for which of the following:
		a. A lavatory drain
		b. A sink drain
		c. A condensate drain
		d. None of the above
Condensate drains may have a minimum diameter of three quarters of an inch. (IPC 314.2.2; UPC Table 814.3). This sizing is based on one drainage pipe. It is acceptable to connect multiple condensate drains to a main condensate drain. When this is the case, the diameter of the main drain must be computed for the total demand that could be placed on the drain. Incorrect answer. Please choose another answer.

142.	What is the minimum pitch per horizontal running foot of piping required for condensate piping?
		a. One eighth of an inch
		b. One quarter of an inch
		c. One half of an inch
		d. One inch
The typical amount of pitch installed on a sanitary drain line is one-quarter of an inch per foot. This is not the case with the drain line for a condensate application. Drains carrying condensate require only one-eighth of an inch of fall or pitch. (IPC 314.2.1; UPC 814.1). These drains do not convey solids, so less pitch is required. Incorrect answer. Please choose another answer.

143.	Some condensate systems require an auxiliary drain pan. When this is the case, the pan is required to be equipped with ____________ or an additional drain line.
		a. An individual vent
		b. A water-level detection device
		c. A drum trap
		d. A backwater valve
Auxiliary drain pans for condensate systems are to be equipped with water-level detection devices that conform to UL 508 or an additional drain line. (IPC 314.2.3; UPC 814.2). Water-level detection devices must shut off any equipment served by the drain pan if an overflow of the drainage pan may occur. Follow the manufacturer's recommendations for any additional requirements that may be needed. There are several ways to install an auxiliary drain line. Incorrect answer. Please choose another answer.

144.	What type of material may be used for the piping of condensate drainage?
		a. Copper tubing
		b. Galvanized steel pipe
		c. PEX tubing
		d. All of the above
Materials approved for condensate piping are as follows: galvanized steel, PEX tubing, copper, polyethylene, ABS, PVC, CPVC and cast iron. (IPC 314.2.2; UPC 814.3). Incorrect answer. Please choose another answer.

145.	When the manufacturer's instructions for the installation of a sterilizer requires a vapor vent, which of the following is required?
		a. Steam reducing stations
		b. Extending the vent through the roof
		c. Water cooled p-traps
		d. It must be trapped.
Not all sterilizers require vapor vents. Sterilizers that are required to have vapor vents are identified based on the manufacturer's requirements for sterilizer installation. (UPC 1303.4.2). When a vapor vent is required, it must extend independently to outside air, generally through a roof. These vents are not allowed to tie into any other venting system. Incorrect answer. Please choose another answer.

146.	How should traps and supplies be installed in rooms that house psychiatric patients?
		a. Pipe-wrap on all traps and exposed piping
		b. All joints exposed must be soldered or solvent welded
		c. All traps and supplies must be concealed
		d. Only metal pipe and traps can be used
All plumbing traps and piping must remain concealed in psychiatric rooms as outlined in plumbing code regulations. (UPC 1303.2). Incorrect answer. Please choose another answer.

147.	When installing aspirators, you must install an_____________.
		a. air gap or vacuum breaker
		b. air break or vacuum breaker
		c. air gap
		d. atmospheric back water valve
You should design the system to discharge through an air gap as this is the only approved means of installation as per code regulations. (UPC 1303.5). Incorrect answer. Please choose another answer.

148.	When installing a bed pan steamer to an indirect waste, the minimum depth of the trap seal is__________.
		a. 1-1/2 inches
		b. 2 inches
		c. 2 -1/2 inches
		d. 3 inches
A trap seal of 3 inches is required for indirect waste piping that collects the waste from a bed pan steamer. (UPC 1303.4.1). All bed pan streamers require the installation of traps. Incorrect answer. Please choose another answer.

149.	Floor drains in food storage areas, walk-in refrigerators or freezers and food service establishments must be indirectly connected to the sewer system by means of a/an ___________.
		a. air gap
		b. double check valve
		c. vacuum breaker
		d. pressure vacuum breaker
All food storage areas must be protected from the sanitary system by means of an air gap or an air break as stated in the plumbing code regulations. (IPC 802.1.1; UPC 418.4, 801.2) Incorrect answer. Please choose another answer.

150.	Pump discharge of wastewater from a swimming pool shall be discharged __________________.
		a. directly into a sanitary sewer
		b. directly into a storm drain
		c. as an indirect waste to a drainage system
		d. Both a and b
Wastewater discharge from a pool must be discharged as an indirect waste. IPC 802.1.4; UPC 813.1). Incorrect answer. Please choose another answer.

151.	Of the following, who is required to keep a permanent record of the location of chemical waste and vent piping?
		a. General Contractor
		b. Owner
		c. Plumbing engineer
		d. City inspector
The owner is required to keep a permanent record of the location of chemical waste and vent piping. (UPC 811.5). Incorrect answer. Please choose another answer.

152.	A furnace is subject to damage due to condensate overflow of an auxiliary drain pan. What step is required to prevent damage to the furnace?
		a. Elevate the furnace above the flood level rim of the drain pan.
		b. Connect the pan directly to the building's sewer drain.
		c. Apply water resistance insulation around the bottom of the furnace
		d. None of the above.
If a condensate overflow condition occurs, equipment, such as furnaces will be exposed to condensate water. Made of sheet metal, most appliance are not suitable for wet environments due the potential for rust. Insulation is not enough, as it can be degraded by water providing conditions for the growth of mold. To address this situation, the codes require that the equipment be elevated above the flood level rim of the drain pan. (IPC 314.2.3.2; UPC 814.2.1). Incorrect answer. Please choose another answer.

153.	Overflow of condensate from equipment would cause structural damage to a building. Which of the following is a protective measure required by the code?
		a. Connecting the equipment drain line directly to a sewer drain.
		b. Use of an auxiliary drain pan
		c. Use of an additional separate drain line
		d. Both b and c.
Where damage to a building or its contents may result from an overflow of condensate from equipment, the codes provide ways to address the matter: (1) use of an auxiliary drain pan; (2) use of an additional separate drain line; or (3) use of a water level detection device that will shut off the equipment in the event of a blockage. (IPC 314.2.3; UPC 814.2). Incorrect answer. Please choose another answer.

154.	Which of the following lengths of a standpipe receptor for a washing machine is permissible measured from above the trap weir?
		a. 12 inches
		b. 18 inches
		c. 36 inches
		d. 48 inches
The standpipe receptor for a washing machine must be at least 18 inches above the trap weir. (IPC 802.4.1; UPC 804.1). The maximum length under the UPC is 30 inches and it's 42 inches under the IPC. Master Plumber Practice Exam - Section 5 Vents and Venting Incorrect answer. Please choose another answer.

Vents and Venting

155.	Why are plumbing traps required to be vented?
		a. To avoid traps being drained of their liquid seals
		b. To convey sewer gas to outside air
		c. To enable drains to drain better
		d. All of the above
Installing vents on plumbing traps enable the drains to drain faster and better. This is due to the air that is allowed to circulate in the drainage system as a result of the vent. Self-cleaning traps, such as P traps, are at risk of being drained of their liquid trap seals if they are not vented. Sewer gas is a health hazard. Vents protect against this risk by transporting sewer gas to open air outside of the building where plumbing is installed. Incorrect answer. Please choose another answer.

156.	Assume that you live in a state that allows the use of combination waste-and-vent plumbing designs for certain applications. While this type of plumbing design is allowed, in various jurisdictions there are restrictions on the types of fixtures which can be installed on such a system. You are responsible as a master plumber to know what can be installed on a combination waste-and-vent system. Choose a fixture from the list below that is not allowed to be installed on a combination system.
		a. Drinking fountain
		b. Urinal
		c. Kitchen sinks
		d. Laundry sinks
Individual vents are not installed for every plumbing trap when a combination-waste-and vent (CWV) system is installed. Air that is required for the system to drain properly is provided through the use of oversized drains instead. Most plumbing fixtures can be installed on a CWV system, but some cannot. The fixtures that are typically not allowed include urinals, toilets, bidets, showers, bathtubs and garbage disposers. (IPC 915.1; UPC 910.7). Incorrect answer. Please choose another answer.

157.	Venting systems for a DWV plumbing installation are required to ___________.
		a. Terminate in open air above the building be served by plumbing
		b. Run independently without tying into a common venting design
		c. Terminate in a ventilated attic space or open air space outside of the building be served
		d. Have a minimum pipe diameter of 2 inches
Vents installed for plumbing systems are required to terminate into open air outside of the building. (IPC Definitions, 904.3, 910.1; UPC Definitions, 906.1). The terminal end of the vent is required to be above the roofline of the building. These vents are not allowed to terminate under an operable window. When operable windows are on either side of a vent pipe the vent must be installed far enough away from the window to avoid sewer gas from being taken in through the open window. This normally means that the vent should be at least ten feet away from a window or rise to a point that is at least two feet above the window. One exception to this is the use of a mechanical vent. These vents are used under hardship situations when they are approved by the local code officer. Mechanical vents are normally installed below plumbing fixtures. These vents require a diaphragm seal to prevent the escape of sewer gas. Incorrect answer. Please choose another answer.

158.	When multiple fixtures discharge into a wet vent, they must do so upstream of the wet vent.
		a. True
		b. False
False - Drainage from additional fixtures that enters a wet vent must enter the piping system downstream of the wet vent. (IPC 912.1; UPC 908.2.5). For example, you might install a wye fitting and extend a drain horizontally to fixtures. The drains from the fixtures must tie into the drainage system prior to the pipe changing into a vent. The fact that the developed length of the pipe serves as both a drain and a vent makes it a wet vent. Incorrect answer. Please choose another answer.

159.	Assume that you are sizing relief vents. In this scenario you will need a total of three relief vents. The drains that will require the vents are three different sizes. Relief vents will be needed for a 1.5-inch drain, a 2-inch drain and a 3-inch drain. Your job is to determine the minimum diameter for these relief valves. Choose the correct answer from the options listed below.
		a. Relief vents are required to have the same diameter of the drain they are serving.
		b. A relief vent with a diameter of 2 inches is adequate for all three drain sizes given.
		c. The minimum diameter required for a relief vent for all of the drain sizes mentioned is 1.5 inches.
		d. The minimum diameter of the relief valve must be determined by the distance that a trap arm extends and the diameter of that drain.
A relief vent can be one-half the diameter of the drain pipe being served by the vent. (IPC 906.2; UPC 904.1). In this scenario each drain can be vented with a 1.5 relief vent. If one of the drains had been piped with a 4-inch diameter it would require a relief vent with a minimum diameter of two inches. Incorrect answer. Please choose another answer.

160.	Circuit vents may be _____________.
		a. Connected to stack vents
		b. Connected to vent stacks
		c. Connected to a main vent system that extends to outside air
		d. All of the above
Circuit vents are allowed to tie into stack vents, vent stacks and venting systems that extend to outside air. They may also extend to outside air independently. Incorrect answer. Please choose another answer.

161.	How would you describe a branch vent?
		a. It is an independent vent.
		b. It is a vent that is used to vent branch drains.
		c. It is a vent that can convey both sewer gas and sanitary drainage.
		d. It is a vent that runs horizontally and provides a connection point for other vents.
The use of branch vents provides a connection point for multiple vents to tie into. The branch vent runs horizontally. There is no limit to the developed length of branch drains that have the same diameter of the drains that it is serving. Plumbers use these vents to reduce labor and material costs in new installations. Having the horizontal branch vent in place allows other vents to terminate in the branch vent rather than to be extended individually to open air. This saves time and money since less pipe and fewer fittings are required to properly vent a system. Incorrect answer. Please choose another answer.

162.	While designing the installation of a circuit vent you have found a need to determine the maximum grade that can be applied to the drainage piping. This piping will be installed horizontally. You refer to your code. The maximum allowable grade for the drain pipe is to be no more than one inch per foot.
		a. True
		b. False
True - Horizontal drains served by circuit vents cannot be installed with a grade of more than one inch per foot. (IPC 914.3; UPC 911.4). Incorrect answer. Please choose another answer.

163.	What type of vent is only allowed to convey air and sewer gas?
		a. A wet vent
		b. A stack vent
		c. A vent stack
		d. An island vent
Many types of vents can carry waste in their lower sections as drains and still provide the services of a vent. However, vent stacks must only be used as vent pipes. They are not allowed to accept drainage from plumbing fixtures. This type of vent is considered to be a primary vent. The vent is to extend to open air above the building containing it. While a vent stack is not allowed to accept drainage, it is acceptable to tie other vents into the vertical vent stack. Incorrect answer. Please choose another answer.

164.	Common vents can only be used ______________.
		a. On sinks and lavatories.
		b. When all fixtures being vented are contained on the same floor level.
		c. When fixtures being served by the vent are on separate floor levels.
		d. On basement plumbing fixtures.
When common vents are used, they must vent only fixtures that are found on the same floor level. (IPC 911.1; UPC 905.6). Most jurisdictions restrict the use of common vents so that they may not serve more than two traps. For example, you could use a common vent for a bathtub trap and a lavatory trap when the fixtures are on the same floor level. A few jurisdictions may not place a limit on the number of traps that can be served, but all jurisdictions do require that all fixtures being served be on the same floor level. Incorrect answer. Please choose another answer.

165.	Which of the following types of plumbing fixtures can be vented with island vents?
		a. Sinks
		b. Floor drains
		c. Showers
		d. Toilets
Island vents can be used only on sinks and lavatories. (IPC 916.1; UPC 909.1). No other plumbing fixtures qualify for the installation of an island vent. These vents are built beneath the flood level rim of the fixture being vented. A cleanout is required in the piping arrangement. Once the island vent reaches a point to turn to a vertical position it must rise to outside open air or tie into another vent at a point at least six inches above the flood level rim of the fixture being vented. Incorrect answer. Please choose another answer.

166.	A wet vent serves as _______.
		a. A vent for one fixture and a drain for another fixture
		b. A special vent that is not allowed for use in a DWV system
		c. A vent for a wet bar
		d. A vent that can only be used above grade.
The use of wet vents can reduce costs for both labor and material. They serve as a vent for one fixture and a drain for a different fixture. When used, wet vents can serve two fixtures that are in the same bathroom group when the wet vent is a horizontal branch drain. The discharge from fixtures must be downstream of a wet vent. When a wet vent is installed vertically the vent can be used to vent any combination of fixtures within two-bathroom groups located on the same floor level. Incorrect answer. Please choose another answer.

167.	Crown vents can be installed on which of the following?
		a. Traps
		b. Trap arms
		c. P traps only
		d. None of the above
Crown-vented traps are not allowed in modern plumbing systems. (IPC 1002.3; UPC 1004.1). Incorrect answer. Please choose another answer.

168.	Vents are not required to be afforded protection from freezing since they transport only air and gases, not water.
		a. True
		b. False
False - Vents develop condensation. Over time the condensation can grow to a point where, if it is freezing, the ice can blow a vent and render it useless. At the very least, the ice can restrict the pipe diameter to a point that is not approved by the code. Therefore, vents must be protected from freezing in regions where freezing is a risk. (IPC 903.6; UPC 906.7). The rule of thumb is that vents installed in locations where outside temperatures may reach a low of zero degrees F are required to be protected from freezing. Incorrect answer. Please choose another answer.

169.	Sewage pumps are sometimes required for plumbing installed in basements. These pumps are used to pump sewage up to a point where it can enter the sanitary drainage system and be carried by gravity to an approved disposal site. These pumps are installed in sumps. These sumps are required to be ______________.
		a. Constructed on welded steel
		b. Covered with a gas-tight cover and vented to outside air
		c. Drained with a separate building drain and sewer
		d. Constructed of plastic
When sewage pumps are installed, the sumps that they are installed in are required to be fitted with gas-tight covers and the sump must be vented to outside air. (IPC 712.1, 712.3.2; UPC 710.10). Vents for sumps are not permitted to be connected to other vents when pneumatic sewer ejector pumps are used. A vent for a sump that houses a sewer pump must have a minimum diameter of 1.25 inches, but they are more commonly installed with 2-inch diameters. Incorrect answer. Please choose another answer.

170.	As a master plumber you will be required to size vents for sumps that contain sewer pumps. There are two factors that you must know in order to size a vent for a sump properly. The most important factor needed to establish a minimum diameter for a vent to serve a sump for a sewer pump is _________.
		a. The discharge capacity, measured in gallons per minute GPM, of the sewer pump
		b. The holding capacity, measured in gallons, of the sump
		c. The voltage rating of the pump intended for use
		d. The incoming load factor, measured in gallons, for the sump
In order to size a vent for a sump that will house a sewage pump you will need to know the discharge capacity of the pump. Once you know this you can use a chart provided in your plumbing code to determine both the minimum allowable pipe diameter for a vent and the total developed length that the vent may run. For example, assume that you know that the discharge rate is 20 gpm. If you use a vent with a 1.25-inch diameter, the vent can run a maximum of 270 feet. But, if you use a 1.5-inch vent the length of the vent is unlimited. (IPC Table 906.5.1) Incorrect answer. Please choose another answer.

171.	What is the maximum allowable discharge capacity of a sewer pump where a 1.25-inch vent can be used?
		a. 60 gpm
		b. 80 gpm
		c. 100 gpm
		d. 149 gpm
A vent with a diameter of 1.25 inches can be used on a sump that will house a sewer pump where the pump discharge capacity will not exceed 149 gpm. Once the gpm rate reaches 150, the minimum vent diameter is 1.5 inches and that is very limited in developed length. Even with a 2-inch vent the developed length cannot exceed 44 feet. You must keep these factors in mind for your sizing work. (IPC Table 906.5.1). Incorrect answer. Please choose another answer.

172.	What is the minimum allowable diameter for a vent that will serve a sump for a sewer pump that has a discharge capacity of 500 gpm?
		a. 2 inches
		b. 3 inches
		c. 4 inches
		d. 6 inches
Once the discharge capacity of a sewage pump reaches 500 gpm, the smallest allowable vent that can be used to vent the sewage sump is three inches in diameter. It is limited to 24 feet of developed length. If a 4-inch vent is used the developed length extends to 130 feet. (IPC Table 906.5.1). Incorrect answer. Please choose another answer.

173.	Offsets cannot be installed in stack vents until the vent reaches a height that is at least 10 inches above the flood-level rim of the highest fixture being served.
		a. True
		b. False
False - Once stack vents rise to a point of at least six inches above the flood level rim of the highest fixture being served it can be offset with fittings. (IPC 913.3; UPC 905.3). Incorrect answer. Please choose another answer.

174.	Plumbing fixtures in residences are required to have at least one main plumbing vent. What is the minimum allowable diameter of the main vent?
		a. 1.25 inches
		b. 1.5 inches
		c. 2 inches
		d. 3 inches
Main vents or vent stacks for homes are required to have a minimum diameter. By rule, the vent must be no less than half the size of the building drain. The absolute minimum is 1.25 inches. (IPC 906.1; UPC 904.1). Incorrect answer. Please choose another answer.

175.	When you are required to size a waste stack vent you will need to know ____________.
		a. The type of fixtures that will connect to the pipe
		b. The flow rate of the pipe
		c. The number of drainage fixture units that the pipe will be required to handle
		d. The developed length of the vent piping
Drainage fixture units are the primary key needed to size waste stack vents. Once you have this, you will have a chart to work with to convert your information into a minimum pipe diameter for the piping. You will need to determine the total discharge of fixture units into one branch interval. The total discharge into the pipe, measured in fixture units, is also needed. With this in hand and the proper sizing chart, you will be able to cross reference from the chart to determine the minimum diameter of the stack size. (IPC 906.1; 904.1) Incorrect answer. Please choose another answer.

176.	What determines the minimum allowable diameter of a wet vent pipe?
		a. The drainage fixture unit load
		b. The developed length of the piping
		c. The amount of slope that the piping will be installed with
		d. The number and types of offsets to be installed in the run of piping
To size a pipe for a wet vent you must know the drainage fixture unit load that the pipe will be exposed to. You will be able to reference a chart provided for you in your code book to determine the proper minimum diameter for a pipe that will be used as a wet vent. (IPC 912.3; UPC 908.1.1). Incorrect answer. Please choose another answer.

177.	You can determine the fixture load in terms of drainage fixture units for a fixture if you know the trap size serving the fixture.
		a. True
		b. False
True - A chart that can be found in your code book will assign a drainage fixture unit rating to common trap sizes. (IPC Table 709.2; UPC Table 702.1). For example, a 1.5-inch trap has a drainage fixture unit (DFU) rating of two. A 2-inch trap has a DFU rating of three and a 4-inch trap has a DFU rating of six. So, once you know the trap size you can determine the DFU rating load that will be on your venting system. Incorrect answer. Please choose another answer.

178.	If an individual vent has two traps it is a ________.
		a. wet vent
		b. double vent
		c. back vent
		d. common vent
A common vent is an individual vent that is to vent two traps or trapped fixtures. It can serve two separate fixtures, but each fixture must have a separate trap. The common vent can serve as the vent for both fixtures. Incorrect answer. Please choose another answer.

179.	When can a combination waste and vent system receive the discharge from a urinal or water closet?
		a. Only if the water is 140 degrees
		b. Only if the vent connects to open air
		c. Only if the water is treated
		d. Never.
A combination waste and vent system is not permitted to connect to urinals or water closets. (IPC 915.1; UPC 910.7). The fixtures that can connect to a combination waste and vent system is floor drains, sinks, lavatories and drinking fountains. Incorrect answer. Please choose another answer.

180.	A _______ is any part of the piping system except a riser, main or stack.
		a. common vent
		b. wet branch
		c. relief vent
		d. branch
Any part of the piping system except a riser, main or stack is a branch. Risers, stacks and mains are the principal arteries of water and waste plumbing systems. Pipes that connect to these arteries are called branches. Incorrect answer. Please choose another answer.

181.	An observation deck is to be constructed on a roof which has an open vent within its perimeter. How far above the roof must the vent terminate at a minimum?
		a. 6 inches
		b. 12 inches
		c. 7 feet
		d. 10 feet
If part of a roof is to be used for assembly, such as for an observation deck, an open vent within its perimeter must terminate at least 7 feet above the roof. (IPC 903.1.2; UPC 906.3). Incorrect answer. Please choose another answer.

182.	All dry vents must rise a minimum of _____ above the flood level of the fixture before tying into the vent.
		a. 8 inches
		b. 4 inches
		c. 6 inches
		d. 10 inches
Every dry vent must rise vertically to a minimum of 6 inches above the flood level rim of the highest trap or trapped fixture being vented. (IPC 905.4; UPC 905.3) Incorrect answer. Please choose another answer.

183.	If a roof is used for social use, how far above the roof must the vent be terminated?
		a. 5'
		b. 7'
		c. 12'
		d. 15'
When a roof is to be used for any purpose other than weather protection, the vent extensions shall terminate at least 7 feet above the roof. This is required to prevent persons using the roof for social activities from encountering sewer gas. (IPC 903.1.2; UPC 906.3) Incorrect answer. Please choose another answer.

184.	What is the maximum number of fixtures that can be connected to a horizontal branch?
		a. 3
		b. 4
		c. 6
		d. 8
A horizontal drainage branch pipe extending laterally from a soil or waste stack can have no more than 8 fixture drains or branches connected to it. (IPC 914.1; UPC 911.4.1) Incorrect answer. Please choose another answer.

185.	When using an air admittance valve, it should have at least ___ stack(s) through the roof.
		a. 1
		b. 2
		c. 3
		d. None of the above
For vent systems utilizing air admittance valves, not less than one stack vent or vent stack within each plumbing system shall extend outdoors to the open air. This will prevent any type of gases from the drainage system to remain in the pipe. (IPC 918.7). Incorrect answer. Please choose another answer.

186.	What is the extension of a soil or waste stack that is connected to the highest drain and then connected to the stack?
		a. Vent Stack
		b. Stack Vent
		c. Branch Vent
		d. Common Vent
This is a method of venting where a uniformly over-sized vertical drain serves as a vent for one or more fixtures. This venting method is limited to use with fixtures discharging waste only. Incorrect answer. Please choose another answer.

187.	How far above the insulation materials should an air admittance valve be installed?
		a. 4 inches
		b. 6 inches
		c. 10 inches
		d. 12 inches
An air admittance valve is to be installed a minimum of 6 inches above insulation materials. (IPC 918.4). Incorrect answer. Please choose another answer.

188.	A plumbing vent system is designed to protect the plumbing system from pressure differentials in excess of ________.
		a. 1 psi
		b. 2psi
		c. 1" water column
		d. 2" water column
The excess pressures cause the loss of trap seal. If a trap seal is lost, odor will enter the building. (IPC 901.2; UPC 901.3). Master Plumber Practice Exam - Section 6 Traps and Cleanouts Incorrect answer. Please choose another answer.

Traps and Cleanouts

189.	An access opening in a drainage system for removal of obstructions is known as a ______.
		a. trap
		b. cleanouts
		c. removable fixtures that can be removed to access for cleaning
		d. Both b and c
A cleanout is an access opening that can be removed to clear drainage systems. A fixture that can be removed to gain entrance to the drainage system can also be used as a cleanout. An example would be a water closet. Incorrect answer. Please choose another answer.

190.	You are drawing the plumbing diagram for a residential installation. Your plumbers will install a sewer for a home. The piping that you are responsible for will begin within the first five feet of the property line for the home location. The municipality will install a lateral to the building lot. The job requires your plumbers to extend the sewer into the home and connect it to a building drain. Where will you show the installation of a cleanout?
		a. At the point of connection between the sewer and the building drain
		b. Outside at the point where the sewer penetrates the foundation in a fashion so that the cleanout is buried no more than six inches in depth
		c. During every 50 feet of piping installed
		d. Within five feet of every change of direction
Your plumbers are required to install a cleanout at the junction point between the building drain and sewer. (IPC 708.1.3; UPC 719.1). This requirement allows service plumbers to clear stoppages in the sewer between the house and the sewer connection at the municipal piping. Depending on the piping position, the cleanout can take the form of a test tee, a wye or a tee-wye. Remember to leave adequate access in front of the cleanout for the snaking of the drain. Incorrect answer. Please choose another answer.

191.	All sewers must _____________.
		a. Be equipped with house drains
		b. Be equipped with backwater valves
		c. Be equipped with cleanouts
		d. Be installed with a metallic covering over the piping to allow it to be found with a metal detector
Sewers are required to have cleanouts. (IPC 708.1.2; UPC 719.3). The cleanouts take the form of manholes when large-diameter sewers are installed. Smaller sewers require cleanout fittings. The sizing and location requirements for cleanouts are detailed in the local plumbing code. Incorrect answer. Please choose another answer.

192.	A cleanout is required within five feet of every change in direction that is in excess of 22.5 degrees.
		a. True
		b. False
False - A 22.5-degree bend can be used for a change in direction without any need for a cleanout. The same is true for 45-degree bends. Under the IPC, cleanouts are required for changes in direction exceeding 45 degrees and, under the UPC, exceeding 135 degrees. (IPC 708.1.4; UPC 707.4). Incorrect answer. Please choose another answer.

193.	Drain pipes that are not building drains or horizontal branches that are installed in second-story framing are _________.
		a. Required to have accessible cleanouts
		b. Required to have no less than one cleanout at the end of the run of piping
		c. Not required to be equipped with cleanouts
		d. Not required to be equipped with cleanouts when the building drain is four inches, or larger, in diameter.
Drain pipes that are not building drains or horizontal branches that are installed in second-story framing are not required to be equipped with cleanouts. This is due to the fact that P-traps and toilets are allowed to act as required cleanouts. Incorrect answer. Please choose another answer.

194.	You are installing a sewer for a home and connecting the sewer to a building drain. Cleanouts are required to be installed within the sewer piping. For which of the following intervals would a cleanout be required for horizontal drainage piping?
		a. 25 feet
		b. 50 feet
		c. 100 feet
		d. 150 feet
Cleanouts are required during the installation of a sewer when the sewer connects to a building drain. The normal spacing of cleanouts in straight runs of a sewer pipe is 100 feet. (IPC 708.1.2; UPC 707.4; 719.1). There are exceptions to these rules, but the information here is the typical installation requirement for cleanouts associated with sewer piping. Additionally, any change in direction in excess of a 45-degree bend (IPC) or 135-degrees in the aggregate (UPC) requires the installation of a cleanout in sewer piping. Incorrect answer. Please choose another answer.

195.	You are installing a sewer with an 8-inch diameter using manholes instead of cleanouts. Which of the following distances between manholes would meet the code for sewers with an 8-inch diameter?
		a. 300 feet
		b. 500 feet
		c. 600 feet
		d. None of the above.
Manholes are typically used on sewers that have diameters of eight inches or more. They may be spaced up to 400 feet (IPC) or 300 feet (UPC) apart. (IPC 708.1.2; UPC 719.6). When manholes are used for access to large sewers the manholes and their covers must be of approved types. All sewer cleanouts are required to be accessible. This is accomplished by installing a riser from the sewer to approximately ground level for the finished grade. The cleanout fitting is then installed on the riser pipe. Protection from flooding is to be provided for manholes and the covers used on manholes are required to allow gases from the sewer to escape to open air. Incorrect answer. Please choose another answer.

196.	You are installing a DWV system for a single-family home. The house will have two toilets. This allows you to have a building drain with a diameter of three inches. Standard procedure is to install a cleanout at the junction of a building drain and sewer. However, there is an exception to this practice. If you do not want to install a cleanout at the junction of the sewer and building drain what is your other option? You can install a cleanout on the 3-inch building drain that is 8 feet from the junction point of the building drain and sewer. If you do this, is it true that you are not required to install a cleanout at the junction point?
		a. True
		b. False
True - You can avoid a junction cleanout by installing a cleanout in the building drain that is no more than 10 feet from the junction point of the building drain and sewer. (IPC 708.1.3; UPC 719.1). Incorrect answer. Please choose another answer.

197.	Horizontal drainage branches must be fitted with cleanouts. Assume that you are installing a horizontal branch that has a total length of 105 feet. This is a 3-inch branch. The pipe takes three changes of direction (90, 45 and 45). See the layout illustration. How many cleanouts are required for this installation?
		a. 1
		b. 2
		c. 3
		d. 4
This scenario requires 3 cleanouts under both the IPC and the UPC. Under the IPC, a cleanout is needed for every change of direction exceeding 45 degrees. Also, when there is more than one change of direction in a run of pipe, there needs to be a cleanout for every 40 feet of developed length. Using these standards, we need 1 cleanout for the 90 degree turn and 2 cleanouts for the two 40 feet of developed length. (IPC 708.1.4). Under the UPC, a cleanout is needed for every 100 feet of developed length of pipe or a fraction thereof. Furthermore, a cleanout is needed for every aggregate change of direction that exceeds 135 degrees. Using these standards, we need 2 cleanouts for the distance, 100 feet and the 5 feet beyond that, and 1 for the aggregate change in direction since it goes over 135 degrees. (UPC 719.1). Incorrect answer. Please choose another answer.

198.	What size cleanout must be used with a 2 ½ inch horizontal drain pipe?
		a. 1-1/2"
		b. 2"
		c. -1/2"
		d. 3"
Under the IPC, the cleanout must be the same size as the piping served, provided the pipe being served is 4" or under. If over 4", only a 4" cleanout need be used. (IPC 708.1.5). Under the UPC, a 2-1/2" pipe needs a 2-1/2" cleanout. (UPC 707.1 table). Incorrect answer. Please choose another answer.

199.	Junction cleanouts installed where sewers meet building drains are required to be of an approved two-way design.
		a. True
		b. False
False - It is acceptable to install a two-way cleanout as a junction cleanout, but there are other approved types of cleanouts that may also be used. These include, but are not limited to, test tees, tee-wyes with cleanout fittings, wyes with female adapters and screw-in plugs connected to them. (IPC 708.1.9; UPC 707.4). Incorrect answer. Please choose another answer.

200.	What type of drain requires the installation of a cleanout when two eighth bends are used to create a 90-degree change in direction?
		a. A drain serving a water closet or urinal
		b. A drain that is below the main floor level of habitable space
		c. A drain that receives the waste from a garbage disposer
		d. Cleanouts are not required when changes in direction are made with eighth bends.
Cleanouts are not required when changes in direction are made with eighth bends or other fittings with less of an angle than an eighth bend. This is due to the moderate rate of the change in direction. (IPC 708.1.4; UPC 707.4). Incorrect answer. Please choose another answer.

201.	Cleanouts installed in floors can extend to grade level so that the top of the cleanout plug is at grade level.
		a. True
		b. False
True - When cleanouts are provided for underfloor piping, they may extend to grade level so that the top of the cleanout plug is at grade level. (IPC 708.1.11; UPC 707.9). This design may be most practical when the cleanouts are located in travel paths. They have to be fitted with recessed cleanout plugs to prevent tripping hazards. Incorrect answer. Please choose another answer.

202.	Assume that you are preparing to plumb a small apartment building. The plumbing for the building is spread out. It runs into a full basement where it goes below the concrete floor. This building will contain two 4-inch stacks and four 3-inch stacks. How many cleanouts will you be required to supply for the combined stacks prior to their entry at the point of the concrete floor?
		a. 6
		b. 4
		c. 3
		d. 2
Each stack is required to have a cleanout at the base of the stack. (IPC 708.1.3; UPC 719.1). This means you will need six cleanouts on the stacks where they enter the floor. The cleanouts must be provided with adequate access for cleaning the drains if they become blocked. Incorrect answer. Please choose another answer.

203.	Cleanouts must _________.
		a. Be accessible.
		b. Be readily accessible
		c. Be visible
		d. Be marked with an indelible, permanent tag to identify them as cleanouts
Cleanouts are required to be accessible. (IPC 708.1.11; UPC 707.8). They can be installed in closets, in cabinets, in walls when access panels are provided, and in similar locations. The key is that cleanouts must be accessible for drain cleaning with minimal effort and with no damage done to the property in order to expose the cleanouts. Incorrect answer. Please choose another answer.

204.	You are drawing a riser diagram for a DWV system. In this design drawing you have shown all the anticipated piping and identified it. In doing so you specify clearance distances for fixtures and cleanouts. Your drawing stresses the minimum distance of clearance that is required in front of a cleanout. A minimum of 18 inches of clear space is required in front of a cleanout that has a diameter of 2 inches.
		a. True
		b. False
True - Cleanout clearance distance in front of a 2-inch cleanout is to be no less than 18 inches. (IPC 708.1.10; UPC 707.9). With a 3-inch pipe, the clearance under the IPC is still 18 inches, but under the UPC it goes to 24 inches. Incorrect answer. Please choose another answer.

205.	Which of the following materials is acceptable for cleanout fittings, plugs and caps?
		a. Copper alloy
		b. PVC
		c. ABS
		d. All of the above.
The codes provide tables with acceptable materials for cleanout fittings, plugs and caps. (IPC Table 702.4; UPC Table 707.2). Only approved materials may be used for the construction of cleanout plugs. The plugs must be durable and strong enough to be removed throughout the life of the plumbing system. Incorrect answer. Please choose another answer.

206.	You are designing the installation of a sewer that will have a 10-inch diameter. As you calculate the need for manholes on straight runs of pipe you will have to identify manhole locations. You will want to show a manhole installation at distances that are no more than ______ feet apart to comply with the code.
		a. 100 feet
		b. 200 feet
		c. 300 feet
		d. 500 feet
To be safe, you should show the maximum distance between manholes not exceeding 300 feet. (IPC 708.1.2; UPC 719.6). Some jurisdictions will allow the spacing to run as far as 400 feet. (IPC 708.1.2). Manholes are typically used on sewers that have diameters of eight inches or more. Protection from flooding is to be provided for manholes and the covers used on manholes are required to allow gases from the sewer to escape to open air. Incorrect answer. Please choose another answer.

207.	What type of connection is normally used for the installation of manholes?
		a. Welded connections
		b. Flexible compression connections
		c. Poured-concrete connections
		d. Precast flange connections
Flexible compression connections are normally used to install manholes. The connections are not allowed to be closer than one foot to a manhole and not more than three feet away from a manhole. Incorrect answer. Please choose another answer.

208.	What is the minimum depth of a trap seal?
		a. 1 inch
		b. 1.25
		c. 1.5 inches
		d. 2 inches
The minimum depth of a liquid trap seal is two inches. (IPC 1002.4; UPC 1005.1). This depth must be maintained. If the trap is not used often the trap seal may evaporate. If there is a risk of the trap drying out, a trap prime is to be installed. This is a device that detects a falling level of liquid in a trap and then introduces water into the trap if the trap seal is in risk of dropping below the required minimum. Incorrect answer. Please choose another answer.

209.	Double trapping is required on laundry tubs to prevent lint from entering the sanitary drains.
		a. True
		b. False
False - It is a code violation to double trap any plumbing fixture. (IPC 1002.1; UPC 1004.1). Incorrect answer. Please choose another answer.

210.	What is the main risk associated with a trap that is not properly vented?
		a. The trap could be drained through backpressure
		b. Flooding of the trap due to backflow
		c. The trap may be prone to blockages
		d. Pressure changes in the piping could rupture the solvent-weld joints
Vents for traps provide a number of benefits, but the main risk associated with a trap that is not vented is the possibility that the liquid trap seal may be sucked out of the trap due to backpressure. If this happens the trap will no longer be sealed and sewer gas can escape into a building. This can be a health concern. For this reason, the plumbing code sets forth requirements for maximum distances between vents and the traps that they serve. This information can be found in the venting section of the code. (IPC 901.2, 909.1; UPC 901, 1002). Incorrect answer. Please choose another answer.

211.	Which of the following types of traps are not allowed in new plumbing installations?
		a. Bell traps
		b. S traps
		c. Crown-vented traps
		d. All of the above
P traps are the modern plumbing trap of preference. S traps are still in use in older buildings, as are many other types of traps, but they are not approved for new installations. Other types of traps that are no longer allowed in new plumbing installations include the following: • Crown-vented traps • House traps • Running traps • Bell traps • Drum traps, except when they are used as solid interceptors or in chemical waste systems • Traps that depend on moving parts or interior partitions (IPC 1002.3; UPC 1004.1). Incorrect answer. Please choose another answer.

212.	Clothes washers may discharge into a kitchen sink or a laundry sink as an indirect waste.
		a. True
		b. False
False - Clothes washers are allowed to discharge into laundry sinks as a means of an indirect waste. (IPC 409.4; 1003.6; UPC 1001.2). They are not, however, allowed to discharge into a kitchen sink. The depth of the sink bowl for a kitchen sink is inadequate to handle the volume of discharge. Incorrect answer. Please choose another answer.

213.	What is the maximum allowable height of a tailpiece that is installed between a fixture and the fixture's trap?
		a. 8 inches
		b. 10 inches
		c. 16 inches
		d. 24 inches
Tailpieces are not to be longer than 24 inches in length. (IPC 1002.1); UPC 1001.2). Longer tailpieces can result in blowback when waste conveyed by the tailpiece makes contact with a trap or drainage fitting. In such a case, the water can splash back up the tailpiece while leaving solids lodged in the drain. When additional length is needed, and can be achieved by having the tailpiece enter the drainage piping system, offset the remainder of the drop to prevent a direct fall of water that may not drain the pipe properly. Incorrect answer. Please choose another answer.

214.	__________ are required to be equipped with a device that controls the water flow through the trap in a manner that prevents the water flow from exceeding the rated flow of the trap.
		a. Grease traps
		b. Gasoline traps
		c. Sand traps
		d. P traps
Grease traps must be equipped to prevent water from flowing through the interceptor too quickly. (IPC 1003.3.5.2; UPC 1017.4). Flow ratings are assigned to specific grease traps. The maximum flow rating is not to be exceeded. The inner portions of grease traps are designed to capture grease that is in water being drained from a fixture and released into a sanitary drainage system. The traps are designed for specific water flowage to ensure that the grease will be collected properly. If water is allowed to pass through the interceptor too quickly the grease may move through with the drain water and collect in the general sanitary drainage system. Incorrect answer. Please choose another answer.

215.	Assume that you are installing a laundry sink. The tailpiece from the drain of the sink has a diameter of 1.5 inches. Just as you are preparing to install a 1.5-inch P trap, your customer comes in to the room. The customer wants you to install a 2-inch trap so that it will be less likely to clog. It is common to install a 1.5-inch trap on a lavatory that has a tailpiece with a diameter of 1.25 inches. So, you can upsize the trap on the laundry tray to 2 inches without any problems.
		a. True
		b. False
False - You cannot upsize the trap for a laundry sink. The trap is required to have the same diameter as the tailpiece. (IPC 1002.5; UPC 1003.3). Incorrect answer. Please choose another answer.

216.	Floor drains that are installed in a concrete floor with no access to the trap can be trapped with ___________.
		a. P traps that have permanently-sealed joints
		b. Plastic traps that are sealed with slip nuts and washers
		c. Brass traps with mechanical joints.
		d. Drum traps
Traps installed below a concrete floor where there is no means of access to the trap should be P traps that use solvent-weld joints. Since the traps are self-cleaning and have permanent joints, they can be installed below grade without access. Incorrect answer. Please choose another answer.

217.	Plumbing interceptors are designed to stop which of the following from entering a sanitary drainage system?
		a. Grease
		b. Sand
		c. Oil
		d. All of the above
Plumbing systems are to be protected from grease, sand and oil. This is done with the use of interceptors. Interceptors stop the entry of harmful amounts of the substance being intercepted from entering a sanitary drainage system. Each type of interceptor requires specific installation procedures. Refer to the manufacturer's recommendations prior to installing an interceptor. Then rely on your plumbing code for the remainder of the data you will need to make an approved installation. Incorrect answer. Please choose another answer.

218.	You will have to determine total flow-through ratings and grease retention capacities when working with grease traps. Assume that you have determined that the total flow-through rating is 20 gallons per minute (GPM). Now that you know this, you can determine the grease retention capacity. Based on what you have been told, how many pounds of grease can the grease interceptor with a flow rate of 20 gpm hold?
		a. 20 pounds
		b. 30 pounds
		c. 40 pounds
		d. 60 pounds
A conversion table is provided in your code book to allow you to size grease trap capacity. The answer is 40 pounds. You can use the chart, or you can use a simple rule-of-thumb that will result in the same answer. (IPC Table 1003.3.5.1). Take the flow rate and double it and you will have the grease capacity in pounds. As an example, you can use this simple calculation. A = Total flow-through rating C = Grease retention capacity A x 2 = C Incorrect answer. Please choose another answer.

219.	Which of the following locations are likely to contain a backwater valve?
		a. Sewers and drains
		b. Water distribution piping
		c. Vent stacks
		d. Circuit vents
Backwater valves are intended for installation on drains and sewers. You can think of a backwater valve as something like a check valve. The device allows water to flow in only one direction. In other words, the backwater valve allows a drain to drain and does not allow water due to a blocked drain to move up the piping past the point of the backwater valve. A backwater valve must be installed in such a way to make it readily accessible. (IPC 714.3; UPC 710.6). Incorrect answer. Please choose another answer.

220.	Assume that you are installing piping for a commercial facility. Some of the drains will convey chemicals, enzymes and emulsifiers. Knowing this, which of the following is not allowed to accept waste that contains enzymes, emulsifiers and chemicals?
		a. Garbage disposers
		b. Interceptors
		c. P traps
		d. Special waste piping
The plumbing code does not allow garbage disposers to accept waste that contains bacteria, chemicals, emulsifiers or enzymes. Incorrect answer. Please choose another answer.

221.	What is the minimum number of traps required to collect the drainage from a three-bay kitchen sink?
		a. 1
		b. 2
		c. 3
		d. 2 traps and one tailpiece inlet side waste
Only one trap is required. (IPC 1002.1; UPC 1001.2). A continuous waste can be used to connect the drainage from all three-sink bowls and convey it to a single trap that is in a location central to all three-sink bowls. All three-sink bowls can be vented with a single vent for the trap serving the sink. Incorrect answer. Please choose another answer.

222.	Which of the following is a device that separates oil from normal waste while allowing waste to discharge into the drainage system by gravity?
		a. Floor drain with trap primer
		b. Septic tank
		c. Cistern
		d. Interceptor
An interceptor is a device that is designed and installed to separate and retain for removal, by automatic or manual means, deleterious, hazardous or undesirable matter from normal waste, while permitting normal sewage or waste to discharge system by gravity. Incorrect answer. Please choose another answer.

223.	What can be done to prevent trap seal loss?
		a. Double trap line
		b. Install a running trap
		c. Install a trap primer
		d. Install a wet vent line
Where a trap seal is subject to loss by evaporation a trap seal prime can be installed. Incorrect answer. Please choose another answer.

224.	How far in vertical distance can an outlet be from a trap weir?
		a. 24 inches
		b. 36 inches
		c. 42 inches
		d. 48 inches
The vertical distance from the fixture outlet to the trap weir cannot exceed 24 inches. (IPC 1002.1; UPC 1001.2). A fixture cannot be double trapped. Incorrect answer. Please choose another answer.

225.	You are working on an existing building. There is a storm drain or downspout at the base of the stack. You decide to connect onto the existing cleanout connection rather than cutting into the stack. Is this correct procedure?
		a. Yes, only if a new cleanout connection is installed close to the existing cleanout and is approved by the code official.
		b. Yes, only if a male adapter of the same material is used on a connection.
		c. No, as stated in the plumbing code.
		d. Yes, when the adapter is PVC or ABS it can be connected to the existing piping, but only in a residential use.
In order to use an existing cleanout as a connection point you must have permission from a code official and install a new cleanout as close to the exiting cleanout as possible. All installations need to comply with code requirements. Incorrect answer. Please choose another answer.

226.	To protect a living space from methane and other decaying waste, a ______ can be installed on both waste and storm systems.
		a. trap
		b. relief drain
		c. flush system to prevent gas to build up in the drainage system
		d. backwater valve
A trap is a fitting that provides a liquid seal to prevent the emission of sewer gases into a building through a fixture without affecting the flow of the drain. Incorrect answer. Please choose another answer.

227.	You are working with an indirect waste receptor. It is up to you to determine if a trap is needed and where it should be placed. Which of the following lengths of indirect waste piping should be trapped?
		a. 12 inches
		b. 24 inches
		c. 60 inches
		d. None of the above.
Standard practice is to trap the drain of an indirect waste if the drainage pipe will extend more than five feet in length. (UPC 803.3). The IPC requires a trap on indirect waste piping that exceeds 30 inches of developed length or 54 inches of total developed length. (IPC 802.3). No vent is usually required for the indirect drain. Check your local rules and regulations to be certain on this point. In other cases, a simple floor drain can serve as a receptor, but the drain must be trapped and a vent is normally required for this trap. Incorrect answer. Please choose another answer.

228.	You are trying to determine a trap size for a fixture that is not listed in the code book. The drain piping is 1 ½" in size. What is the smallest trap size that can be used on this fixture?
		a. 1-1/4 inches
		b. 1-1/2 inches
		c. 2 inches
		d. A code official must determine the size of the trap.
The minimum trap size for fixtures that are not in the code book are to be the same size as the drain pipe, but not less than 1 ¼ inches. (IPC 709.2). In this case a 1 ½ inch trap would be required. Incorrect answer. Please choose another answer.

229.	You are installing a floor drain in a closet that very seldom gets used. You want to make sure that the fumes do not escape by means of evaporation. What can be installed to prevent this condition from occurring?
		a. Install a backflow preventer.
		b. Vent the trap by means of a wet vent.
		c. Install a trap primer to prevent the seal loss from evaporation.
		d. Install a running trap that will give double protection from trap seal loss.
A trap primer can be installed to prevent trap seal lose by evaporation. This can be accomplished by installing a trap primer valve to the cold-water supply. Incorrect answer. Please choose another answer.

230.	You are roughing-in a drain arm to a future lavatory fixture. In order to comply with the Code, you should measure from the _______________________ to make sure you do not exceed the maximum distance.
		a. center of the vertical vent to 90° stub out
		b. inner edge of the vent to the trap weir
		c. inner edge of the vent to 90° stub out
		d. center of the vent to the trap weir
Measurements are determined from the trap weir to the inner edge of the vent serving that fixture. Incorrect answer. Please choose another answer.

231.	Which of the following directional changes of a trap arm will not need a cleanout?
		a. 45 degrees
		b. 100 degrees
		c. 125 degrees
		d. 135 degrees
Under the IPC, a directional change of 45 degrees or less in horizontal drain piping does not need a cleanout. (IPC 708.1.4). Under the UPC, changes of direction under 90 degrees do not need a cleanout. (UPC 1002.3). Incorrect answer. Please choose another answer.

232.	What can be done to protect a trap seal from evaporation?
		a. Install a deep seal trap
		b. Install a swing check
		c. Install a trap primer
		d. Both a and c
Trap seals can be protected from evaporation by a deeper seal or a priming device. You can also protect them with a few table spoons of vegetable oil (not mentioned in code books). Incorrect answer. Please choose another answer.

233.	The liquid seal of a fixture trap shall be at least _________________________.
		a. 1.5"
		b. 1.25"
		c. 2"
		d. Both a and b
The minimum liquid trap seal is 2" and not more than 4" unless the plumbing authority determines a deeper seal is needed. (IPC 1002.4; UPC 1005.1). Incorrect answer. Please choose another answer.

234.	Traps must be designed in such a way that they ________.
		a. Have movable parts
		b. Have a flow pattern that offers resistance
		c. Are resistant to corrosion and degradation
		d. None of the above.
Fixture traps must be made of materials that are resistant to corrosion and degradation. They have to be self-scouring and have a smooth and uniform interior. They are not to have movable parts or interior partitions, except where they are integral with the fixture. Traps must have a flow pattern that offers minimal resistance, so a uniform flow velocity can carry solids through the U-shaped area and into the fixture drain. (IPC 1002.2; UPC 1004.1 and 2). Incorrect answer. Please choose another answer.

235.	Which of the following measurements is permitted for a 2" trap arm from a vent?
		a. 5'
		b. 9'
		c. 10'
		d. 16'
5' or 60" is the maximum allowable distance for a 2" diameter pipe under the IPC. (IPC Table 1002.2). Under the IPC, up to 8' is permissible for a 2" dimeter pipe. (IPC Table 909.1). Incorrect answer. Please choose another answer.

236.	Which of the following fittings are approved for changes in piping direction from vertical to horizontal?
		a. Wye
		b. Combination wye with eighth bend
		c. Neither a nor b
		d. Both a and b
Both of the listed fittings are allowed for changes in piping from a vertical to horizontal position. (IPC Table 706.3; UPC 706.2). Additionally, any fitting allowed for changes in horizontal-to-horizontal direction are also approved for use when turning to a horizontal position. Incorrect answer. Please choose another answer.

237.	Which of the following is an allowable distance for a 1.5" drain arm to a fixture trap?
		a. 48"
		b. 46"
		c. 44"
		d. 30"
The maximum allowable horizontal distance is 30" under the IPC and 42" for the UPC. (IPC 1002.1; UPC Table 1002.2). Incorrect answer. Please choose another answer.

238.	Cover plates, trim covers and access doors may be used with cleanouts. These access points may not be covered with mortar, plaster or other permanent material.
		a. True
		b. False
True - Cleanout plugs must be accessible. (IPC 708.1.11.1; UPC 707.8). Cover plates, trim covers and access doors for clean out plugs must not be covered by mortar, plaster or other permanent material. Incorrect answer. Please choose another answer.

Water Supply and Distribution

239.	When sizing a water distribution system for a residence using water supply fixture units, which of the following must be taken into account?
		a. Fixtures served by the piping
		b. Water pressure of the system
		c. Developed length of distribution piping
		d. All of the above.
When designing a water distribution system for a residence, the codes require the plumber to determine the water supply fixture units that the system will serve, the water pressure of the system and the developed length of the water distribution piping, measured from the water service line to the most remote fixture being serviced by the water distribution system. After determining these factors, the plumber uses the tables in the IPC and UPC to determine the size of the water service piping and the water distribution piping. (IPC Appendix E, Table E104.1; UPC 610.4). Incorrect answer. Please choose another answer.

240.	A backflow connection is __________________.
		a. the piping used to install backflow preventer
		b. the devise used to prevent reverse flow in a drainage system
		c. any arrangement whereby backflow can occur
		d. a connection that allows a higher pressure than the supply pressure of the system
A backflow connection could be the end of a hose in a puddle, a connection to a boiler that uses chemical treatment or a fill line to a soda system, just to name a few. Incorrect answer. Please choose another answer.

241.	What is the load value, in water supply fixture units (wsfu), for a public clothes washing machine with an automatic control that handles 15 lbs. of laundry?
		a. 2.0 (wsfu)
		b. 3.0 (wsfu)
		c. 4.0 (wsfu)
		d. 5.0 (wsfu)
A public washing machine with an automatic control that handles 15 lbs. of laundry has a water supply fixture unit of 4.0. (IPC Appendix Table E103.3(2); UPC Table 610.3). Incorrect answer. Please choose another answer.

242.	What is the minimum size pipe allowed supplying water to a bathtub?
		a. 3/8"
		b. 1/2"
		c. 3/4"
		d. 1"
The minimum size pipe allowed to supply water to a bathtub is 1/2" in diameter. (IPC Table 604.5; UPC Table 610.3). Incorrect answer. Please choose another answer.

243.	You are calculating the flow rate requirements for a residential shower. A flow rate of 2.5 gallons per minute is acceptable under the code.
		a. True
		b. False
A flow rate of 2.5 gallons per minute for a residential shower meets the code requirements. (IPC Table 604.3; UPC 408.3). It is the minimum required under the IPC and maximum allowed under the UPC. Incorrect answer. Please choose another answer.

244.	A plumber is renovating a bathroom and discovers that an electrician had used the copper piping as grounding for the electrical system. Can the plumber remove the copper pipe and replace it with plastic piping?
		a. No
		b. Yes, as long as the plumber informs the owner.
		c. Yes, as long as the ground is reattached to the plastic pipe.
		d. Yes, as long as the electrician reattaches the ground to the plastic piping.
In this situation, the plumber may not replace the metal piping with plastic piping. The code does not permit the replacement of metal piping used as a ground for electric systems with nonmetallic piping, unless another approved means of grounding is provided. (IPC 601.3; UPC 604.10) Incorrect answer. Please choose another answer.

245.	What is the minimum size of allowed for a water service pipe connected to a water main supplying a water distribution system?
		a. 1/2"
		b. 3/4"
		c. 1"
		d. 1-1/2"
Under the code, a water service pipe must not go under a 3/4" piping. (IPC 603.1; UPC 610.8). Incorrect answer. Please choose another answer.

246.	When a fixture is installed away from a wall what is the minimum air gap required for a sink?
		a. 1.25 inches
		b. 1.5 inches
		c. 2 inches
		d. 3 inches
The minimum distance for an air gap being installed as described in the scenario is 1.5 inches. (IPC Table 608.16.1; UPC 603.3.1, Table 603.3.1). Depending on the type of fixture you are working with and whether it is installed next to a wall, the air gap requirement ranges from one to three inches. Use the sizing table in you code book when you are required to determine a distance for a minimum air gap. Incorrect answer. Please choose another answer.

247.	The minimum required height of a barometric loop is 40 feet high. This is necessary since 38 feet is the minimum height at which vacuum suction cannot occur.
		a. True
		b. False
False - The minimum required height of a barometric loop is 35 feet. (IPC 608.14.4). When this is the case, the barometric loop can be used as a vacuum breaker. This is because the height of the loop is high enough to prevent vacuum suction. Incorrect answer. Please choose another answer.

248.	Which of the following types of pipe deliver water at the fastest flow rate?
		a. PEX
		b. Copper
		c. CPVC
		d. Galvanized steel
This answer is likely to surprise you, but galvanized steel pipe can deliver water at a faster flow rate than PEX, copper or CPVC piping. It would seem logical that the roughness inside of galvanized water piping would slow water down. Most people would think that a smooth pipe, such as copper or PEX, would be capable over moving water faster. They are not. Why? It is due to the wall thickness of the pipe. Since galvanized pipe has a thicker pipe wall it can work under greater pressure than a thin-walled pipe can. Therefore, the galvanized pipe is capable of providing a faster flow rate. As an example, most materials approved for water distribution have a flow rate of about 5 feet per second. The rating for galvanized pipe is about 8 feet per second. Incorrect answer. Please choose another answer.

249.	You are sizing a water distribution system for a single-family home. Assume that the home has a 1-inch water service that terminates once it enters a basement so that it can be converted to waster distribution piping. The house has two full bathrooms, one powder room, a kitchen sink, a garbage disposer, a dishwasher, a bar sink, a washing machine hook-up, a water heater and three hose bibs. Without going into depth to determine absolute minimum pipe sizing, what size piping is most likely to be used for the main cold water distribution pipe?
		a. 0.5 inch
		b. 0.75 inch
		c. 1 inch
		d. 1.25 inch
Normally a single-family home can be piped with the main water distribution piping having a diameter of 0.75 inch. Typically, no more than two plumbing fixtures are allowed to be served by a water distribution pipe with a diameter of 0.5-inch diameter. This means that you install 0.75-inch pipe as the main pipe and branch off of it with pipes having diameter of either 0.75-inches or 0.5 inches. The key is knowing the fixture-unit rating for the fixtures being served. You can find this information in a table that most code books contain. A pipe with a larger diameter may be required when the number and types of fixtures change. But all you really have to do is refer to your sizing tables to make your design. In some cases, you can extend a pipe with a 3/8-inch pipe to serve a fixture. It all comes down to the fixture-unit rating requirements as set forth in your code book. Incorrect answer. Please choose another answer.

250.	When a private well is installed in the vicinity of a waste disposal system, such as a septic drain field, the water services should _____________.
		a. Be installed through the bed in a way not to disturb the percolation chambers or gravel
		b. Be installed above the waste disposal system
		c. Be installed under the bed with a minimum depth of two feet between the disposal system and the piping for the water service
		d. Be installed a minimum of 50 feet from the nearest portion of the drain field.
A minimum distance of 50 feet is required between a private well and a septic tank. (IPC Table 608.18.1; UPC Appendix H, Table H 101.8). It is never acceptable for a water service to be installed above, through, or under a septic system or other waste disposal system. Due to the potential risk of contamination from the waste disposal system entering the water service and contaminating the potable water supply, this rule is meaningful and must be observed. Incorrect answer. Please choose another answer.

251.	Now you are trying to find the most cost-effective way to provide a water service and a sewer to a building. It would cost less if you put both pipes in a single trench. In fact, the code allows a water service and sewer to be installed in the same trench.
		a. True
		b. False
True - A water service can be installed in the same trench that contains a sewer. (IPC 603.2; UPC 609.2; 720.1). The two pipes must be separated. The water service is normally installed on a stable shelf, usually made of dirt, that provides a solid platform for the installation. The water service must be at least 12 inches above the sewer. If this is not practical, the two pipes can be installed on the same level as long as the two pipes are spaced a minimum of five feet apart and separated by undisturbed or compacted earth. Incorrect answer. Please choose another answer.

252.	Which of the following pertains to a code requirement on the use of flexible water connections?
		a. Flexible water connections must be readily accessible.
		b. Flexible water connections must be accessible.
		c. Flexible water connections are limited to first-floor installations.
		d. Flexible water connections must be supported.
Flexible water connections must be accessible. (IPC 605.6; UPC 604.5). The connectors can be installed in cabinets and closets. They may also be installed behind access panels. As long as the devices can be serviced with the removal of an access panel or the opening of a door, they are accessible. Incorrect answer. Please choose another answer.

253.	A minimum distance of 100 feet is required between a pasture and a potable water well.
		a. True
		b. False
True - The minimum allowable distance between potable water wells and pastures is 100 feet. (IPC 608.18.1). The well must be protected from contamination. Having 100 feet between a well and a pasture is intended to prevent runoff from the pasture from contaminating the water well. Incorrect answer. Please choose another answer.

254.	You are designing a water distribution system. Based on your experience and a review of the building plans, you have some concern that the pipes may bang or vibrate after they are installed. This can create wear on the piping that could result in future leaks. How will you protect against these concerns?
		a. Run all piping as straight as possible to avoid offsets where water would be making turns and therefore creating a water hammer.
		b. Avoid the installation of slow-closing valves.
		c. Install 45-degree offsets in long runs of piping to prevent water from rushing through the piping and coming to an abrupt change of direction.
		d. Install only PEX piping
Banging water pipes can make loud, obnoxious noises. The vibrations in the pipes can also wear holes in the piping where it is supported. This may result in a leak. The official term for banging water pipes is water hammer. Long, straight runs of water piping can lead to water hammer. This can be avoided by installing 45-degree offsets along runs of piping. Air chambers and water-hammer arrestors can be installed at fixtures to provide a cushion of air that will prevent water hammer. Quick-closing valves are a potential cause of water hammer. These valves are commonly found in use with washing machines and ballcocks. Incorrect answer. Please choose another answer.

255.	The maximum allowable water pressure in residential water distribution systems is __________.
		a. 40 pounds per square inch
		b. 60 pounds per square inch
		c. 80 pounds per square inch
		d. 100 pounds per square inch
Residential plumbing systems are to be equipped with water distribution systems that operate at no more than 80 pounds per square inch. (IPC 604.8; UPC 1505.5; 1506.5). Street pressure for the water delivered from a municipality can be higher than this. If this is the case, the installation of a pressure reducing valve is required near the connection between a water service and a water distribution pipe. This valve allows you to adjust the pressure rating to remain in compliance with the plumbing code. Incorrect answer. Please choose another answer.

256.	Water storage tanks must not be installed __________.
		a. Below kitchens
		b. Below mechanical rooms
		c. Below soil pipes
		d. Below bathrooms
It is a code violation to install a water storage tank under soil or waste pipes. (IPC 606.5.8). There is too much risk the leakage from the drains could reach a potable water source. Gravity-style water storage tanks must be equipped with overflow provisions. Water supplies to water storage tanks must be automatically controlled. All incoming water must pass through an air gap that is at least four inches above the overflow for the tank and all tanks must be capable of being drained. They must also be equipped with a drain valve to prevent unwanted draining. Incorrect answer. Please choose another answer.

257.	Which of the following is required when a diaphragm-type pressure tank is installed for the delivery of potable water from a well?
		a. A vacuum relief valve
		b. A double check valve
		c. A pressure balancing valve
		d. A pressure relief valve
Pressure tanks installed with a well system and that are constructed with a diaphragm design are required to be protected by a pressure relief valve. (IPC 606.5.9; UPC 607.6). You can install the valve on nearby water piping or on the tank. Most of these tanks are fitted with a tank-tee that is set up to accept the installation of a pressure relief valve. The valve must be rated for the requirements of the manufacturer's rating of the tank. Incorrect answer. Please choose another answer.

258.	Pipe supports used to secure water distribution pipes must be __________.
		a. Be made of a material that is the same as the material used to make the pipe that is being secured
		b. Be made of plastic
		c. Be made of a material that is resistant to corrosion
		d. Be made of a ferrous material
Supports used to hang and secure water piping must be made of a non-corrosive material. (IPC 308.3; UPC 313.2). The two most common materials used for this purpose is plastic and copper. Hangers and supports should be sized properly to fit the piping that they are supporting. Vibration and movement of a supported pipe in a hanger or support could result in wear that would lead to a leak. Incorrect answer. Please choose another answer.

259.	A minimum depth of 10 feet of grouting for a potable well must be extended into the earth if the well casing does not hit bedrock.
		a. True
		b. False
True - Well casings are protected from the influx of ground water when grouting is installed. (IPC 608.18.5). Potable water wells are required to be protected around their casings with grouting that is installed to a minimum depth of at least 10 feet below ground level. An exception to this is when bedrock is encountered closer than 10 feet from the ground surface. Once bedrock surrounds a well casing grouting is not needed. Incorrect answer. Please choose another answer.

260.	How far apart can supports be spaced when installing 1" copper piping in a horizontal position for water distribution?
		a. No more than 4 feet
		b. No more than 6 feet
		c. No more than 8 feet
		d. No more than 10 feet
Copper water tubing and pipe smaller than 1 ¼" (IPC) or 1 ½" (UPC) installed horizontally for water distribution is to be supported at maximum intervals of six feet. (IPC Table 308.5; UPC Table 313.3). The spacing of supports varies depending on the type of piping or tubing being used. Type of Piping Material Maximum Span Between Pipe Supports ABS 4 Feet PVC 4 Feet Cast Iron 5 Feet Galvanized Steel 12 Feet DWV Copper 10 - 12 feet (IPC Table 308.5; UPC Table 313.3) Incorrect answer. Please choose another answer.

261.	Sill cocks require ________.
		a. A backflow preventer
		b. A minimum water supply of 0.75 inch in diameter
		c. A tempering valve
		d. A thread-mounted backflow preventer
When sill cocks are installed, they must be protected against backflow. (IPC 608.16.4.2; UPC 603.5.7). This can be done with a thread-mounted backflow preventer that cannot be removed or an integral vacuum breaker. In addition to a backflow preventer, every sill cock is required to have its own independent cutoff valve. This does not have to be a full-open valve. Stop-and-waste valves are normally used. Incorrect answer. Please choose another answer.

262.	An example of a full-open valve is a __________valve.
		a. Gate
		b. Stop-and-waste
		c. Stop
		d. Quick-closing
Full open valves are so named because, when they are open, the internal diameter of the piping is not restricted. (See UPC 606.4). Gate valves and ball valves are full-open valves. These valves are machined for a positive closing action that does not incorporate the use of rubber washers. When a valve must be counted on to close or is not allowed to restrict water flow, full-open valves are used. Incorrect answer. Please choose another answer.

263.	Assume that you are a plumber working in a rural location. There are a lot of farms in the area where you work. In this example an old farm house burned to the ground and a new one is being built. You will be installing the water service from the submersible well pump to the new house. The farm has livestock on it. There are also buildings related to the farming activities. How far from the barnyard should the water service pipe be installed?
		a. 50 feet
		b. 75 feet
		c. 100 feet
		d. 300 feet
The water service pipe must be at least 100 feet away from the barnyard to avoid potential risk of contamination. (IPC 608.18.1). This is not the type of situation that many plumbers run into, but some do work in farming communities and the question could appear on your exam. There is a table in your code book that details minimum required distances like the one cited in this example. Incorrect answer. Please choose another answer.

264.	What is the most dependable type of backflow prevention?
		a. An air break
		b. An air gap
		c. A double check valve
		d. A vacuum breaker
Air gaps provide the most dependable form of backflow protection. When they are used there is a physical drop between the fixture delivering water and the fixture receiving it. An example of this would be a tub spout. The tub spout is never subjected to contact with drainage water, so backflow is essentially impossible. Incorrect answer. Please choose another answer.

265.	Jet pumps installed in basements must be installed a minimum of 18 inches from the finished floor level.
		a. True
		b. False
True - Jet pumps must be protected from the potential risk of flood waters. To accomplish this, jet pumps installed in basements must be mounted a minimum of 18 inches above the finished floor. (IPC 602.3.5). This is assumed to be a height that is not likely to be affected by flood water collected in a basement. Incorrect answer. Please choose another answer.

266.	Carbonated beverage dispensers require the installation of a ______________ on the incoming water supply.
		a. Vacuum breaker
		b. Butterfly-style backflow preventer
		c. Pneumatic backflow preventer
		d. Vented backflow preventer
Carbonated beverage dispensers require the installation of a vented backflow preventer that is not affected by carbon dioxide gas. (IPC 608.17.1.1; UPC Table 603.2). This can be an internal backflow preventer or one that is installed on the incoming water supply. Most carbonators are equipped with approved, manufacturer-installed backflow prevention devices. Incorrect answer. Please choose another answer.

267.	Connections between potable water supply systems and automatic fire sprinkling systems are to be made with _________.
		a. Mechanical joints
		b. A check valve
		c. A vented backflow preventer
		d. A flanged joints and stainless-steel bolts
A check valve is required to be installed between a potable water source and an automatic fire sprinkling system. (IPC 608.17.4; UPC 603.5.14). This is the base requirement. The type of sprinkling system used can require additional devices to be installed. You have to identify each type of system and confirm the requirements for the system being used. But, in all cases, a check valve is required to be installed in the piping between a potable water source and the sprinkling system. Incorrect answer. Please choose another answer.

268.	What is the maximum developed length of piping from a recirculating system to a fixture that requires hot water?
		a. 50 feet
		b. 80 feet
		c. 100 feet
		d. 150 feet
Water distribution piping that uses a recirculating system to pump hot water cannot exceed 50 feet in developed length to the fixture being served. (IPC 607.2). The use of these pumps is common in large buildings, such as hotels. The pump keeps hot water moving to maintain the desired temperature at the prescribed distance required. It can become expensive to heat water continuously, but when the source of hot water cannot maintain the required temperature for the prescribed distance there is little choice but to install additional heating units along the water distribution piping or to install a recirculation pump. Incorrect answer. Please choose another answer.

269.	Pex water pipe and tubing can be used as a water distribution material. However, there is a limit to how close PEX piping can be installed to the top of a water heater. Some type of metallic pipe or connector is required to connect to a water heater and it must rise to a point at least _____ inches above the water heater before PEX tubing or piping can be attached to it.
		a. 4
		b. 6
		c. 12
		d. 18
The installation of Pex tubing and piping for water distribution to and from a water heater is restricted so that the Pex material will not be closer than 18 inches to the connection point. (UPC 604.13). Metal connectors are available to fill the gap between the PEX and the water heater. If that is not desirable, copper piping or tubing can connect directly to the water heater and then be converted to PEX once the height requirement is met. Incorrect answer. Please choose another answer.

270.	Inlet and outlet copper water connections to an electric water heater should contain _________.
		a. Unions
		b. Dielectric Unions
		c. Compression Unions
		d. Galvanized Unions
Unions should be installed on both the inlet and outlet piping for a water heater. This facilitates the easy removal of the water heater. The unions used with copper pipe or tubing should be dielectric unions. (UPC 605.15). These unions contain a rubber washer that breaks the metal-to-metal contact. When this happens, unintended electrical current cannot pass from the water heater through metallic water piping. This prevents someone from touching a water pipe and receiving an electrical shock that has transferred from an electric water heater. Incorrect answer. Please choose another answer.

271.	Water piping that is approved for use as a water service and not approved for use as water distribution piping must be converted to piping that is suitable for a water distribution system ___________________.
		a. At the inlet piping to a water heater
		b. Prior to the piping turning to a vertical position
		c. Within the first 3 feet of entry of the building
		d. At the full-open valve installed on the water service when it enters a building
A full-open valve is required to be installed on a water service pipe when it enters a building. (IPC 605.3; UPC 606.2). This is also the point where a conversion from one type of material to another is required if the piping used as a water service is not rated for use as a water distribution pipe. Normally this will occur within the first five feet of the water service piping entering a building. Incorrect answer. Please choose another answer.

272.	You want to run a water service line above a sewer pipe in the same trench. How much dirt must be laid between the pipes?
		a. 6 inches
		b. 12 inches
		c. 18 inches
		d. 24 inches
The water service line must be at least 12 inches above the sewer pipe on a stable shelf. (IPC 603.2; UPC 609.2; 720.1). Incorrect answer. Please choose another answer.

273.	You are installing a water service line and a sewer pipe in different trenches that run near each other. The water service pipe and the sewer pipe are made of ABS. Of the following distances, what is the closest distance, horizontally, that the water service line can be installed in proximity to the sewer pipe?
		a. 1 foot
		b. 3 feet
		c. 5 feet
		d. None of the above.
The codes do not address how far apart, horizontally, separate trenches for a water service line and a sewer pipe can run if listed piping materials, like ABS or PVC, are used. If an unlisted piping material is used, the IPC requires a five-foot separation between the water service and the building sewer, which can be reduced if the water service line is placed 12 inches higher than the sewer line. (IPC 603.2). Incorrect answer. Please choose another answer.

274.	You are installing a water service line and realize that the line must pass over the sewer pipe to attach to the water main. The water service piping is not to be sleeved. What separation must you provide between the water service line and the sewer pipe?
		a. 12 inches
		b. 24 inches
		c. 36 inches
		d. 5 feet
If a water service line crosses over a building sewer, it must be 12 inches above the building sewer line. (IPC 603.2; UPC 609.2). Under the IPC, if the water service line is sleeved, five feet in both directions from the sewer pipe centerline, the 12-inch requirement may be reduced. Incorrect answer. Please choose another answer.

275.	Backflow preventers must not be located in areas subject to _________.
		a. freezing
		b. flooding
		c. Both a and b
		d. Neither a nor b
All backflow prevention devices must be protected from freezing and flooding. (IPC 305.4, 608.15.2; UPC 603.4.7). Underground installation is not permitted, because the operation or leakage cannot be detected and could become submerged. Incorrect answer. Please choose another answer.

276.	What is required to be installed on all water supply fixtures, except residential bathtubs and showers?
		a. Shutoffs
		b. Vacuum breakers
		c. Angle adapters
		d. Dielectric unions
The code requires shutoffs on all fixtures; however, bathtubs and showers have concealed piping that may be difficult to access. (IPC 606.2). In the cause of an emergency, the water supply can be turned off at each individual fixture while the remainder of the water piping to the house can remain on. Incorrect answer. Please choose another answer.

277.	A freeze proof yard hydrant that drains into the ground is considered to be a ___________.
		a. stop and waste valve
		b. full flow ball valve
		c. gate valve
		d. ball valve
A freeze proof yard hydrant that drains the riser into the ground is considered to be a stop and waste valve. (IPC 608.8; UPC 603.5.17). Incorrect answer. Please choose another answer.

278.	What size water service is required from a urinal with a flushometer valve?
		a. 3/8-inch water line
		b. 1/2-inch water line
		c. 3/4-inch water line
		d. 1-inch water line
A 3/4-inch water line is required to provide sufficient water pressure and volume to properly flush the urinal with a flushometer valve. (IPC Table 604.5; UPC Table 610.3). Incorrect answer. Please choose another answer.

279.	Kitchen sinks must have a minimum _____ inch water supply line.
		a. 1/4
		b. 3/8
		c. 1/2
		d. 5/8
The water distribution piping size 1/2" provides the minimum necessary flow and pressure for the fixture. (IPC Table 604.5; UPC Table 610.3). Incorrect answer. Please choose another answer.

280.	You instruct your plumber to install the water piping in a manner to prevent air hammer. What needs to be installed on the piping system to prevent this from occurring?
		a. Mechanical air arrestors
		b. Air relief valves
		c. Air admittance valves
		d. Pressure relief valves
The plumbing code requires mechanical air arrestors to be installed on both hot and cold water lines to prevent air hammer. (IPC 604.9; UPC 609.11). This is also necessary to keep the joints from breaking in the system. Incorrect answer. Please choose another answer.

281.	All plumbing pipe and fittings, including valves and faucets, can have a maximum of ____ lead content.
		a. 3%
		b. 5%
		c. 8%
		d. No lead is permitted.
Pipe and fittings, including valves and faucets, utilized in water supply can have a maximum of 8% lead content. (IPC 605.2; UPC 604.2.1). Incorrect answer. Please choose another answer.

282.	When installing a flush-o-meter on a water closet, what must be provided to prevent cross connection from occurring?
		a. Back water valve
		b. Pressure relief valve
		c. Atmospheric vacuum breaker
		d. Double check valve
Atmospheric vacuum breakers are connected as part of the flush-o-meter assembly to provide an air gap from the drainage pipe to the water supply. (IPC 415.2; UPC 603.5.1). This connection is in the lowest part of the flush-o-meter assembly. Incorrect answer. Please choose another answer.

283.	What must be installed when you use quick closing valves?
		a. A vacuum breaker
		b. A reducing valve
		c. A water-hammer arrestor
		d. A pressure reducing valve
A water-hammer arrestor must be installed where quick- closing valves are utilized. (IPC 604.9; UPC 609.11). Incorrect answer. Please choose another answer.

284.	If water pressure exceeds 80 psi static pressure, what must be installed on the incoming water supply?
		a. Check Valve
		b. Control valve
		c. Stop and waste Valve
		d. Pressure reducing valve
When water exceeds 80 psi, a reducing valve must be installed on the incoming water supply. IPC 604.8; UPC 1505.5; 1506.5). This will allow for the proper operating pressure for all fixtures and prevent excess pressure to buildup in the water heater. Incorrect answer. Please choose another answer.

285.	Which backflow prevention device is not approved for cross-connection control?
		a. Double check valve
		b. Air gap
		c. Swing check
		d. Pressure vacuum breaker
A swing check is only used to minimally protect water flow. (IPC Table 608.1; UPC Table 603.2). Incorrect answer. Please choose another answer.

You are sizing the piping for a water supply distribution system. The water supply distribution system will serve the following fixtures:

Kitchen sink
Dishwasher
Bathroom sink (2)
Bathtub/shower (2)
Clothes washer (15 lbs.)
Toilet (3)

The water pressure in the system is 50 psi. The total length of developed pipe is 110 feet.

286.	Is a water heater considered a fixture in the determination of the water supply fixture units when sizing a water distribution system?
		a. Yes, with a 1 wsfu
		b. Yes, with a 2 wsfu
		c. Yes, with a 3 wsfu
		d. No.
A water heater is not counted as a fixture in the sizing of water distribution piping since the water only passes through the tank into the water supply system. It is treated as a pipe. Incorrect answer. Please choose another answer.

287.	What is the minimum size water service pipe must be used?
		a. 3/8
		b. 1/2
		c. 3/4
		d. 1
The first step in determining the pipe size for the water service piping is to determine the water supply fixture units (wsfu) that the system will serve. Using the tables in the IPC and the UPC we get the following wsfu totals: Kitchen sink 1.4 1.5 Dishwasher 1.4 1.5 Bathroom sink (2) . 7 x 2 1 x 2 Bathtub/shower (2) 3 x 2 4 x 2 Clothes washer (15 lbs.) 4 4 Toilet (3) 2.2 x 3 3.5 x 3 20.8 27.5 Next, we go to the tables that cover a system with a water pressure of 50 psi. Using the proper table, we use the developed length of pipe and find the wsfu in the column covering that developed length. Moving to the left column of the table, we find that a 3/4“ water service pipe would be the minimum size that could be used in this design. (IPC Appendix E, Tables E 103.3(2), E104.1; UPC Tables 610.3, 610.4). Incorrect answer. Please choose another answer.

288.	What is the minimum size water distribution piping that must be used?
		a. 1
		b. 1-1/4
		c. 1-1/2
		d. 2
The first step in determining the pipe size for the water service piping is to determine the water supply fixture units (wsfu) that the system will serve. Using the tables in the IPC and the UPC we get the following wsfu totals: Kitchen sink 1.4 1.5 Dishwasher 1.4 1.5 Bathroom sink (2) . 7 x 2 1 x 2 Bathtub/shower (2) 3 x 2 4 x 2 Clothes washer (15 lbs.) 4 4 Toilet (3) 2.2 x 3 3.5 x 3 20.8 27.5 Next, we go to the tables that cover a system with a water pressure of 50 psi. Using the proper table, we use the developed length of pipe and find the wsfu in the column covering that developed length. Moving to the left column of the table, we find that a 1” water distribution pipe would be the minimum size that could be used in this design. (IPC Appendix E, Tables E 103.3(2), E104.1; UPC Tables 610.3, 610.4). Incorrect answer. Please choose another answer.

Sanitary Drainage Systems

289.	Assume that you are sizing a drainage system and want to determine the total load on the system as you design it. With this in mind, how many gallons per minute of drainage will two fixture units represent?
		a. 1
		b. 2
		c. 3
		d. 4
Two fixture units represent one gallon per minute of flow. (IPC Table 709.1 footnote UPC 710.5). Under the IPC, a drainage trap with a 1.5-inch diameter has a rating of two fixture units. This means that a fixture served by a 1.5-inch trap is expected to produce a drainage flow of up to one gallon per minute. (IPC Table 709.2). Under the UPC, a 1.5-inch diameter drainage trap is given a rating of 3 fixture units. (UPC Table 702.1(1)). Incorrect answer. Please choose another answer.

290.	The size of a drainage pipe should not be _______ in the direction of the flow.
		a. pro pressed
		b. reduced
		c. filed
		d. crimped
Pipe size should not be reduced in the direction of the flow. (IPC 704.2; UPC 717.1). This is fundamental to drainage. A reduction in size would create an obstruction to the flow and possibly cause a backup. The use of a 4" x 3" water closet flange or bend and a 4" x 3" water closet flange is not considered a reduction in size under the IPC. Incorrect answer. Please choose another answer.

291.	Assume that you are sizing a drainage system that will contain a pump. Further assume that horizontal drainage piping will be installed with a grade of 1/4 of an inch per linear foot. To determine the minimum piping diameter required for the waste pipe connected to the pump you will ___________________.
		a. Calculate the number of fixture-unit ratings and base your pipe sizing on this information.
		b. Calculate the vertical lift of the pump and the fixture-unit ratings served by the pump.
		c. Calculate the flow rate of the pump in gallons per minute and multiply that by two to arrive at the fixture-unit load on the pump.
		d. Assign a gpm rating of 8.5 to the pump and determine pipe size based on fixture-unit ratings
Sizing a drain pipe for a sewage pump requires you to calculate the flow rate of the pump and assign two fixture units for every gallon of flow per minute. Consider this example: the sewage pump has a flow rate of 5 gpm. You assign two fixture units for each gpm and arrive at a total of 10. The fixture-unit load on the pump is determined to be 10. There have been some exceptions to this concept. There have been circumstances when the flow rate is assigned one fixture unit for every 7.5 gpm. The safest method for sizing the discharge piping for a sewage pump is to refer to a table in your code book. The chart will give you some concrete options. For example, under the IPC, a pump that has a capacity of 21 gpm requires a 2-inch drain. (IPC Table 712.4.2). A pump with a capacity of 30 gpm requires a 2.5-inch pipe. Since 2.5-inch pipe is rarely used, the move here would be to upsize the pipe to a 3-inch diameter. When this is done the drain can carry up to 46 gpm of pump capacity. Under the UPC, a sewage pump must have a discharge capacity of at least 20 gpm. (UPC 710.3). Incorrect answer. Please choose another answer.

292.	What is the minimum length of a branch interval of a vertical stack?
		a. 1'
		b. 3'
		c. 6'
		d. 8'
A branch interval of a vertical stack is no less than 8 feet. (IPC Definitions; UPC Appendix C 201.1). It is basically the length of a waste stack relative to the story height of a building. Incorrect answer. Please choose another answer.

293.	When installing a dishwasher, how many drainage fixture units should be accounted for?
		a. .5
		b. 1
		c. 2
		d. 3
The answer is based on the referenced charts under the IPC and UPC. (IPC Table 709.1; UPC Table 702.1). Two DFU is equal to 1 gallon per minute of continuous flow. Incorrect answer. Please choose another answer.

294.	When plumbing is roughed in for future use, the increased load of drainage that could be created by future fixtures must be factored into the sizing of the drainage system.
		a. True
		b. False
True - Plumbing that is roughed in or stubbed out for potential future use is to be taken into consideration when sizing a drainage system. (IPC 710.2; UPC 703.1). For example, if you rough in a bathroom for a shower, a lavatory and a toilet, the flow load of all of these fixtures must be used in determining the minimum sizing of a drainage system. Incorrect answer. Please choose another answer.

295.	Sizing procedures for sewers is done with the same practices and principles that are used when sizing ________________.
		a. Horizontal branches
		b. Soil stacks
		c. Vent stacks
		d. Building drains
Sewers and building drains are sized using the same sizing criteria. Horizontal branches are sized in a similar fashion, but the data used for sizing horizontal branches is different from what would be used for a sewer or a building drain. The minimum diameter for a pipe that will convey waste from a water closet is three inches. (IPC Table 710.1(1) footnote; UPC Table 702.1). A 3-inch sewer installed with a slope of 1/4 inch per foot can carry up to 35 fixture units under the UPC and up to 42 fixture units under the IPC. (IPC Table 710.1(1); UPC Table 703.2, Table 717.1). If a 4-inch sewer is used under the same conditions it can handle up to 216 fixture units under both codes. Incorrect answer. Please choose another answer.

You are sizing a horizontal branch drainage pipe serving a kitchenette sink and a bathroom including a lavatory, shower/bath fixtures, water closet and a floor drain.

296.	What is the load on the horizontal branch drain pipe in drainage fixture units (DFU)?
		a. 8
		b. 10
		c. 11
		d. 12
Using the DFU tables in the codes, the following units are given to the following fixtures: Kitchenette sink - 2 Bathroom sink - 1 Shower/bath fixtures - 2 Water closet - 3 Floor drain - 1 Total: 10 DFUs (IPC Table 709.1; UPC Table 702.1). Incorrect answer. Please choose another answer.

297.	Which of the following would be the smallest size drainage pipe needed to comply with the code?
		a. 1-1/2"
		b. 2"
		c. 3"
		d. 4"
With 10 DFUs, and looking at the tables in the codes for horizontal fixture branches, a 3" pipe would comply with the codes. (IPC Table 710.1(2); UPC Table 703.2). Under the IPC, only a 3-inch drainage pipe can be used with a toilet. So, even if the DFU Table resulted in a 2-inch pipe, like with a bathroom group equaling 5 DFUs on a horizontal branch, since it connects to a toilet, a 3-inch pipe would be required. (IPC 710.1(1), footnote a). Incorrect answer. Please choose another answer.

298.	You are installing a horizontal 4" building drain pipe in accordance with a permitted work design. What is the slope that is required?
		a. 1/16" per foot
		b. 1/8" per foot
		c. 1/4" per foot
		d. 1/2" per foot
The minimum allowable slope allowed per linear foot for the installation of a 4" sewer or building drain pipe is 1/8 of an inch. (IPC Table 710.1(1); UPC 718.1). In common practice, an 1/8 of an inch is considered to be the smallest slope to be used in the field. Most plumbing professional prefer and use 1/4 of an inch of fall per foot. A 1/16 of an inch is allowed for pipes 8" or larger. (IPC Table 710.1(1); UPC Table 717.1). Incorrect answer. Please choose another answer.

299.	Sizing a drainage stack requires you to identify ________________.
		a. The amount of slope designed for the piping
		b. The fixture-unit load on each story of height
		c. The fixture-unit load entering a stack at each branch interval
		d. The size of the sewer that the stack will connect to
When you are sizing a drainage stack you must know the fixture-unit load that is entering the stack at each branch interval. Since stacks are used as connection points for horizontal branches there can be a lot of fixture units dumped into a stack. For example, under the IPC, a 4-inch stack can take up to 90 fixture units of total discharge into one branch interval. (IPC Table 710.1(2)). If there are more than three branch intervals the stack is allowed to carry up to 500 fixture units. Incorrect answer. Please choose another answer.

300.	Horizontal branch drains may ________.
		a. Turn to a vertical rise
		b. Not receive waste from kitchen sinks
		c. Connect to a vent stack
		d. Have a minimum diameter of 2 inches
Horizontal branches are drain pipes that branch off of a plumbing stack. They normally run in a horizontal position. However, they can turn to a vertical rise and still be considered horizontal branches. Incorrect answer. Please choose another answer.

301.	When is a vent not required for a vertical offset in a stack?
		a. When the stack has horizontal branches connected to it
		b. When the stack has a minimum diameter of three inches
		c. When the stack is sized as a building drain
		d. When the stack has a minimum diameter of four inches
Vertical offsets are not required to be vented where a stack and its offset is sized as a building drain. (IPC 710.1.2). This means that the stack must be sized using the criteria for a building drain. Stack sizing rules could allow for a smaller diameter than what would be allowed for a building drain. If this is the case, the offset will have to be vented. Incorrect answer. Please choose another answer.

302.	You are sizing a building drain pipe that has waste stack with 6 horizontal drainage pipes connected to it. The design uses a 1/4" slope per foot. The DFUs of the horizontal pipes are as follows: 15 DFU 80 DFU 35 DFU 80 DFU 70 DFU 30 DFU What minimum size building drainage pipe is required?
		a. 3-inch
		b. 4-inch
		c. 5-inch
		d. 6-inch
To size the building drain, the plumber must first calculate the DFUs emptying into it. In the scenario, there is a total of 310 DFUs. Referring to the tables in the codes, a drain pipe handling 310 DFUs would have to be no smaller than 5 inches in diameter. (IPC Table 710.1(1); UPC Table 703.2). Incorrect answer. Please choose another answer.

303.	Assume you are installing drainage piping in and around a food service area. Which of the following locations are not allowed to have exposed drainage piping installed above them?
		a. Areas used for storage
		b. Surfaces provided for eating
		c. Work areas
		d. All of the above
Due to the risk of leakage and potential contamination, exposed drainage piping is not allowed to be installed above work areas, storage areas or eating surfaces in or around food service areas. (UPC 317.1). Incorrect answer. Please choose another answer.

304.	You have a contractor who has been asked to provide plans and specifications for a job that will involve two homes on the same building lot. The potential homeowner will live in one house and use the other one as a rental property. There is no zoning requirement that prohibits this construction in the proposed location. As a cost-saving method, the contractor wants to use one sewer and one water service to provide municipal services to both dwellings. This will cut down on plumbing costs and the payment for tap fees will be cut in half. Multiple buildings situated on the same building lot may share a common building sewer.
		a. True
		b. False
True - Multiple buildings situated on the same building lot are permitted to share a common building sewer. (IPC 701.3). Incorrect answer. Please choose another answer.

305.	Which of the following types of joints can be used to join dissimilar piping materials?
		a. Mechanical
		b. Soldered
		c. Welded
		d. Brazed
Mechanical joints are used when joining dissimilar pipes. These mechanical joints can be made with compression joints or mechanical-sealing devices. The devices used to make the joints are required to have approved elastomeric seals. Incorrect answer. Please choose another answer.

306.	Sewage ejector pumps are required to have ____________ installed on the discharge piping from the sewage pump.
		a. Ground-nut unions
		b. A relief valve
		c. A check valve
		d. A 2-inch trap
A check valve is required to be installed on the drainage piping from a sewage pump. (IPC 712.2; UPC 710.3). You must also install a full-open valve on the discharge side of the check valve. Both the check valve and the full-open valve are required to be accessible. The full-open valve is needed in the event that the pump of the check valve must be replaced. Closing the valve keeps the head of sewage above the check valve and the pump from spilling out when the check valve or pump is removed. The installation of a full-open valve is to be installed above the cover of a sewage sump that contains a pump. On the rare occasions when this is not feasible, the valve has to be installed outside of the sewage sump. This requires the use of an access pit. You might find limited exceptions to this regulation. One such example is a one- or two-family dwelling where a full-open valve is not required. However, even when a full-open valve is not required it should still be installed for servicing purposes. Incorrect answer. Please choose another answer.

307.	Not all fittings can be used for all purposes. You must know which fittings are approved for your intended use. Imagine that you are installing horizontal drain piping above ground. You want to turn the drain from one horizontal direction to another. Which of the following fittings are suitable for a change of direction from a horizontal position to another horizontal position?
		a. Sixteenth bend
		b. Long-sweep elbow
		c. Eighth bend
		d. All of the above
The fittings allowed to change direction with horizontal piping include the following: • Sixteenth bend • Wye • Eighth bend • Sixth bend • Long-sweep fittings • Combination fittings • Wye with eighth bend The reason these fittings are allowed is that they have a subtle change in direction. An abrupt change in direction could result in drain blockage. (IPC Table 706.3; UPC 706.3). Incorrect answer. Please choose another answer.

308.	A drainage pipe has a diameter of six inches and uses flexible couplings at changes in direction. The piping must be supported at the point of the flexible connection.
		a. True
		b. False
True - Flexible couplings on pipes with a diameter in excess of 4-inches that create a change in direction are required to be supported to prevent any loosening pertaining to the coupling. (IPC 308.7.1; UPC 313.4). Incorrect answer. Please choose another answer.

309.	Which of the following fittings are approved for changes in piping direction from vertical to horizontal?
		a. Wye
		b. Combination wye with eighth bend
		c. Neither a nor b
		d. Both a and b
Both of the listed fittings are allowed for changes in piping from a vertical to horizontal position. (IPC Table 706.3; UPC 706.2). Additionally, any fitting allowed for changes in horizontal-to-horizontal direction are also approved for use when turning to a horizontal position. Incorrect answer. Please choose another answer.

310.	Blowback water closets can be installed back-to-back when they share a common back wall. What fitting will you show in your plumbing design to receive the discharge from the two toilets? Remember that they could each discharge at the same time.
		a. A double sanitary tee
		b. A double tee-wye
		c. A cross tee
		d. A blowback tee
You can use a double tee-wye to accept the drainage from two blowback toilets that are installed back-to-back on a common wall. (IPC 706.3; UPC 704.2). A double-wye with 45-degree bends in each side outlet can also be used. This is essentially a homemade tee-wye. Some plumbers prefer to use tee-wyes as combination fittings. These are the only fittings allowed for the use described in the question. This fitting is approved due to the directional control that the fitting design offers. Waste discharge from one toilet cannot pass straight through the fitting into the other toilet. This would be possible with a cross tee or a double sanitary tee. Incorrect answer. Please choose another answer.

311.	Assume that you are installing drain pipes below grade. It is your job to make joints to connect sections of piping. Which of the following types of connections are you allowed to use?
		a. Mechanical joints with elastomeric seals
		b. Solvent-weld joints for plastic piping
		c. Caulked joints for cast-iron piping
		d. All of the above as described
Underground piping can be joined in a number of ways, depending on the type of pipe being installed. When mechanical joints are used, they are required to have elastomeric seals. Plastic piping is normally connected with solvent-weld joints, but they can be joined by other means, such as rubber couplings that are held in place with stainless-steel clamps. Cast-iron pipe that is of the bell-and-spigot type can be caulked with okum and lead. In reality, caulked joints are rarely used in modern plumbing installations. Rubber insert connectors are far more common for bell-and-spigot cast-iron pipe. The key is to match a suitable connector to the type of pipe being installed. (IPC 705; UPC 705). Incorrect answer. Please choose another answer.

312.	________ always involve at least two changes in direction to keep the piping heading in the same direction.
		a. Offsets
		b. Slope pipes
		c. Horizontal piping
		d. Vertical piping
An offset is a combination of approved bends that make two changes in direction bring one section of the pipe out of line but into a line parallel with the other section. Incorrect answer. Please choose another answer.

313.	When you install pipe joint compound or tape it shall be applied on the ______ threads.
		a. male
		b. female
		c. male and female
		d. machine
All threads shall confirm to ASME standards and approved thread lubricant or tape shall be applied on the male threads only. (IPC 705.2.3; UPC 705.4.2). When installing pipe joint compound to the female threads of a fitting it would allow contamination of the liquid inside the piping. The pipe joint compound when placed on the inside or the female threads will cause a shoulder buildup of pipe compound on the inside of the female threads. Incorrect answer. Please choose another answer.

314.	Under what can conditions can waste piping be installed over a food preparation table?
		a. When the pipe has protective covering
		b. Only if PVC pipe is installed
		c. Only if the piping is cast iron with no-hub joints
		d. It is never allowed.
Waste piping cannot be installed above any working storage or eating surfaces in food service establishment. (UPC 317.1). Incorrect answer. Please choose another answer.

315.	Which of the following sizes of cleanouts can be used on a 6-inch pipe to allow for cleaning or cabling?
		a. 6'' clean out
		b. 5'' clean out
		c. 4'' clean out
		d. All of the above.
Under the IPC, if the drain pipe is 4" or above, only a 4" cleanout is needed. (IPC 708.1.5). Under the UPC, drain piping above 4" requires a cleanout of at least 3 ½ inches. (UPC 707.1 table). In our scenario, the drain pipe is 6" in diameter. Therefore, any of the listed size cleanouts (4", 5" or 6") can be used. Incorrect answer. Please choose another answer.

316.	Is it permissible to reduce the pipe size in the direction of the flow if the drain size is 4" or smaller?
		a. Only if the pipe is PVC.
		b. Only in the underground system.
		c. On commercial use only
		d. No.
The drainage piping must not be reduced in any size of the direction of flow. If the pipe is reduced in the direction of the flow, debris could form at the point of reduction, because the larger pipe size would be upstream from the reduction. Example: If you go from 4" down to 3", at the point where it reduces, objects could hang up which could cause a blockage. Incorrect answer. Please choose another answer.

317.	At what interval are cleanouts required on horizontal drain piping?
		a. Every 500'
		b. Every 100'
		c. Every 250'
		d. Not more than 75'
Cleanouts are required every 100' of horizontal drain piping. (IPC 708.1.1; UPC 707.4). Building sewer drain pipes have the same requirement of cleanouts every 100'. (IPC 708.1.2; UPC 719.1). Incorrect answer. Please choose another answer.

318.	You have instructed a laborer to dig a pit hole for a residential sump pump. Which of the following size holes are acceptable for the dimensions (height and diameter) of a sump pit?
		a. 12" H x 24" D
		b. 18" H x 14" D
		c. 12" H x 15" D
		d. 24" H x 18" D
A residential sump pit must be at least 24" height x 18" diameter (IPC) and 18" height x 15" diameter (UPC). (IPC 712.3.2; UPC 1101.6.2). The hole to install the sump pit will need to be dug deeper and wider than the measurements of the sump pump. Incorrect answer. Please choose another answer.

319.	What size drain cleanout is required on a 2 1/2'' waste pipe?
		a. 1 1/2'' cleanout
		b. 2 1/2'' cleanout
		c. 3 1/2" cleanout
		d. There is no limitation.
Under the IPC, the size of a drain cleanout will equal the size of the waste pipe. (IPC 708.1.5). Under the UPC, a 2-1/2" waste pipe requires a 2-1/2" cleanout. (UPC Table 707.1). Incorrect answer. Please choose another answer.

320.	You have installed a sanitary sewer in the floor of a warehouse; a floor cleanout is required at the end of a run. The waste piping size is 6 inches. Which of the following clearances meet the code for proper cleaning?
		a. 12 inches x 12 inches
		b. 14 inches x 14 inches
		c. 16 inches x 16 inches
		d. 24 inches x 24 inches
Under the IPC, 6-inch drain pipe or less need at least 18 inches in clearance. (IPC 708.1.10). Under the UPC, 6-inch drain pipe needs at least 24 inches of clearance. (UPC 707.9). This will give you sufficient clearance to operate an electric sewer cleaning machine. Incorrect answer. Please choose another answer.

321.	You are sizing gravity drainage piping. A 2'' pipe needs to slope a minimum of ______ an inch per foot fall.
		a. 1/2
		b. 1/8
		c. 1/4
		d. 1/3
A 1/4 of an inch per foot fall is the requirement for sizing 2" gravity drainage piping. (IPC Table 704.1; UPC 718.1). Incorrect answer. Please choose another answer.

322.	PVC Schedule 40 may be used for underground drain waste piping and fittings.
		a. True
		b. False
True - PVC Schedule 40 may be used for underground sanitary drainage. (IPC Table 702.2; UPC Table 701.2). Incorrect answer. Please choose another answer.

323.	You are roughing in drainage piping for a future fixture in a part of a building that is partially occupied. Which of the following is required in a stub-out for a future fixture?
		a. That the drainage pipe be painted yellow.
		b. That the drainage pipe terminates below grade.
		c. That the drainage pipe be concealed.
		d. That the drainage pipe terminates with a cap or plug.
A stub-out for drainage piping for future fixtures must terminate with a cap or plug when it will be located in a partially occupied building. (IPC 704.4; UPC 402.11). The requirement prevents foul odors from coming into the building. Incorrect answer. Please choose another answer.

324.	During the course of your plumbing rough-in you are installing several horizontal branches. These drains are connected to stacks. The connections must be made downstream of the stack. But, how far downstream from the stack is the closest location that a connection can be made?
		a. 12 inches
		b. 24 inches
		c. Not less than 10 pipe diameters downstream
		d. Not less than 12 pipe diameters downstream
Backwash into horizontal connections within a zone where hydraulic jump can occur could cause the pipe connections to be closed up. It is required then to construct the fittings in such a way that discharge from one inlet does not enter another. (UPC 706.2). In furtherance of this, the IPC requires that horizontal branches that connect to the bases of stacks be no closer than 10 pipe diameters from the stack. All connections are required to be made on the downstream side of a stack. (IPC 704.3) Incorrect answer. Please choose another answer.

325.

Assume that you are installing a 3" DWV system that is going to consist mostly of plastic drain piping. However, there is one area of the job that has been specified to receive DWV copper piping. When these two types of piping are installed horizontally what is the maximum allowable distance between the hangers that support the piping? The plastic piping must be supported at intervals not to exceed ______ feet and the DWV copper piping is required to have support at intervals not to exceed ________.

a. 2 feet for plastic and 6 feet for DWV copper

b. 4 feet for plastic and 8 feet for DWV copper

c. 4 feet for plastic and 10 feet for DWV copper

d. 6 feet for plastic and 10 feet for DWV copper

326.

You are installing cast iron pipe. What is the maximum support distance allowed by code for cast iron piping that is installed vertically?

a. 4 feet

b. 8 feet

c. 15 feet

d. 20 feet

327.	Caulked lead joints used to connect cast iron pipe are required to be painted either red or orange to provide a visual warning of the pipe's presence.
		a. True
		b. False
False - Caulked lead joints are not allowed to be painted, varnished or otherwise coated until a joint is tested and approved by a code officer. (IPC 705.3.1; UPC 705.2.1). There is no code requirement that calls for caulked joints to be painted. Incorrect answer. Please choose another answer.

328.	One of your journeyman plumbers has encountered different diameter pipe joints. He calls you for instructions. He wants to know if he can use rolling o-rings. What should be your response?
		a. If PVC pipe is used, rolling o-rings are permitted.
		b. If clay pipe is used, rolling o-rings are permitted.
		c. Rolling o-rings are not permitted to be used.
		d. Rolling o-rings are permitted in all cases.
In a sanitary drainage system, joints between diameter pipes made with elastomeric rolling o-rings are prohibited. (IPC 707.1). Elastomeric o-rings may be used on stainless steel drainage systems, press-connect fittings and push fit fittings of copper or copper alloy pipe. (IPC 705.20; UPC 605.1.3.2 and 605.1.3.3). Incorrect answer. Please choose another answer.

329.	If there is no public sewer available what can be done to treat sewerage?
		a. Run waste to drainage ditch
		b. Install a holding tank to be pumped when filled
		c. Run 4-250 feet lines buried under ground that can to seep into the earth.
		d. Install an individual sewage disposal system
When a public sewage system is not available, a system for disposal of domestic sewage must be installed, being a septic tank, cesspool or other mechanical treatment, designed for utilization apart from a public sewer to serve a single establishment or building. Incorrect answer. Please choose another answer.

Special Piping and Storage Systems

330.	How are special pipe and storage systems defined in the plumbing code regulations?
		a. As medical pure oxygen systems
		b. As medical gas systems using nitrous oxide, compressed air, nitrogen and helium
		c. As non-medical gas systems
		d. Both b and c
The plumbing code regulates non-medical oxygen systems and medical gas piping systems using nitrous oxide, compressed air, nitrogen, helium and various mixtures of these gases. Incorrect answer. Please choose another answer.

331.	Which of the following are covered by the plumbing code requirements?
		a. Medical gas systems
		b. Non-medical oxygen systems
		c. Both a and b
		d. Neither a nor b
The plumbing code governs both medical gas systems and non-medical oxygen systems. The coverage of these elements is dealt with as special piping and storage systems or under a category of healthcare facilities and medical gas and vacuum systems. Do not confuse medical uses for non-medical uses. Incorrect answer. Please choose another answer.

332.	Which NFPA standard do the codes reference for healthcare facilities and medical gas and vacuum systems?
		a. NFPA 13
		b. NFPA 90A
		c. NFPA 99
		d. NFPA 211
The IPC and UPC reference NFPA 99 for standards on medical gas and medical vacuum systems. (IPC 1202.1; UPC 1301.3). Incorrect answer. Please choose another answer.

333.	You are laying out a plumbing diagram that calls for the installation of water fountains in the hallways of healthcare facilities. The halls will accommodate patients being transported in wheelchairs. How will you show the installation of water fountains under such conditions?
		a. Drinking fountains are required to be flush mounted.
		b. Drinking fountains are required to be installed for wheelchair access.
		c. Both a or b
		d. None of the above
Drinking fountains installed in corridors of healthcare facilities where patients are transported by wheelchair, gurney or hospital bed must be either fully recessed or flush mounted. (UPC 1303.1). They shall be accessible to patients in wheelchairs. Not only are drinking fountains required to be fully recessed or flush mounted, so are valves associated with them. Drinking fountains and their valves are to be installed in a way that will not come into contact with equipment used to transport patients. Incorrect answer. Please choose another answer.

334.	Sterilizers require an indirect waste receptor that is both trapped and vented.
		a. True
		b. False
True - The drain from a sterilizer has an indirect connection and an air gap. The receptor, floor drain or floor sink will be trapped and vented per the code. (IPC 802.3; UPC 801.6). Incorrect answer. Please choose another answer.

335.	Assume that you are designing a plumbing system for a psychiatric hospital and therapy rooms. This type of facility requires some special plumbing revisions. For example, the general restrooms serving the therapy rooms will accommodate psychiatric patients. What design consideration must you keep in mind when drawing the piping diagram?
		a. Access panels must be installed for all stop valves.
		b. Traps must not be connected with slip-nut connections.
		c. Roll insulated must be installed on piping to prevent burns.
		d. You have to conform the plumbing to be sure that all piping and traps will be concealed.
Plumbing pipes and traps must be concealed when they are installed in rooms that will be used by psychiatric patients. (UPC 1303.2). Incorrect answer. Please choose another answer.

336.	All fixtures and fittings installed in rooms housing psychiatric patients must be ________.
		a. Supplied with only cold water
		b. Firmly bolted to a fixed location
		c. Protected from possible vandalism
		d. Hospital approved
Plumbers are required to install fixtures and fittings used in psychiatric patient rooms so that the components are not subject to vandalism. (UPC 1303.2). This can mean using durable fixtures and concealing piping. The ultimate goal is to design and install a safe plumbing system that will serve the needs of the people using the plumbing. Incorrect answer. Please choose another answer.

337.	The plumbing code pertains only to medical gases that are nonflammable.
		a. True
		b. False
True - The plumbing code pertains to medical gases that are nonflammable. These types of gases are often used in exhalation anesthetic systems and vacuum piping systems. Incorrect answer. Please choose another answer.

338.	Healthcare facilities contain ice makers. These devices must be installed _______.
		a. In the facility kitchen
		b. In a basement location to avoid potential flooding
		c. In a supervised location, such as a nurse station
		d. In hallway alcoves
Ice makers installed for use in healthcare facilities must be installed in locations where regular supervision is available, such as in nurse stations. (UPC 1303.3). Ice producing and storage equipment must be protected from contamination of all types. The equipment is to be maintained in a safe and hygienic manner at all times. Incorrect answer. Please choose another answer.

339.	Patient care areas of a healthcare facility are designated a certain category representing the risk of equipment or system failures to patients being examined or treated. How many Patient Care Space risk categories are there?
		a. 2
		b. 4
		c. 6
		d. 8
There are four Patient Care Space risk categories designating the risk levels if there are equipment or system failures in the healthcare facility. The categories are based on the NFPA 99. The categories are as follows: Category 1 Space - where equipment or system failure is likely to cause major injury or death Category 2 Space - where equipment or system failure is likely to cause minor injury Category 3 Space - where equipment or system failure is not likely to cause injury but can cause some discomfort Category 4 Space - where equipment or system failure is not likely to physically impact patient care (UPC Definitions, Patient Care Space). Incorrect answer. Please choose another answer.

340.	Which of the following are responsible for designating the risk category level of a patient care space in a healthcare facility?
		a. Engineer
		b. Master plumber
		c. Code enforcement officer
		d. Governing body of the healthcare facility
Under the NFPA 99, the healthcare facilities governing body is responsible for designating the category level of spaces within its facility in accordance with the type of care anticipated. (UPC 1302.2) Incorrect answer. Please choose another answer.

341.	Suction equipment that is supplied with water falls under the same regulations of the plumbing code that pertains to aspirators.
		a. True
		b. False
True - Aspirators and suction equipment are both required to comply with the same code requirements when the suction equipment is supplied with water. (UPC 1303.5). In essence, the water supply must be protected from backflow. A vacuum breaker is the most common type of backflow preventer used for this purpose. Incorrect answer. Please choose another answer.

342.	You have to dispatch a plumber to install a sterilizer in a healthcare facility. You have designed the installation procedure. What is the maximum distance of piping for an indirect waste drain?
		a. 2 feet
		b. 4 feet
		c. 15 feet
		d. 20 feet
Indirect-waste drains that serve sterilizers are allowed to have a developed length of up to, but not in excess, of 15 feet. (UPC 801.6). Waste piping is to have a diameter that is equal to, or larger than, the size of the drain connection to the sterilizer. All receptors are required to be located in the same rooms as the sterilizers that they receive waste from. Incorrect answer. Please choose another answer.

343.	Assume that you are drawing a riser diagram that includes vapor vents. These vents are being provided for sterilizers. The building has an extensive network of plumbing being installed and the general contractor has instructed you to design a system that will be as cost effective as possible. With this in mind, what will you show as a piping route for the vents as they rise above the sterilizers?
		a. You will render the installation of mechanical vents once the vent rises six inches above the sterilizer unit.
		b. You will show the vent connecting to a common DWV network or vents.
		c. You will have your plumbing team terminate the vents once they are in a ventilated attic area.
		d. You will require the vents to be extended to outside air without connection to any other system.
Sterilizer vents are not to tie into any other type of venting system. While not all sterilizers require vents, those that do must be vented independently and terminate in outside air. (UPC 1303.4.2). All vapor vents are identified based on the manufacturer's requirements for sterilizer installation. Check the manufacturer's recommendations and requirements prior to drafting a plumbing design for installation. Incorrect answer. Please choose another answer.

344.	A trap seal serves a bedpan steamer. You must install an indirect waste. The minimum depth of the trap seal is ___________.
		a. 1.5 inches
		b. 2 inches
		c. 2.5 inches
		d. 3 inches
A trap seal of three inches is required for indirect waste piping that collects the waste from bedpan steamers. (UPC 1303.4.1). All bedpan steamers require traps. Incorrect answer. Please choose another answer.

345.	Drains from sterilizers must be connected to a drainage system through an indirect-waste connection.
		a. True
		b. False
True - It is true that the drains conveying waste from sterilizers are required to be connected to drainage systems through indirect-waste connections. (IPC 608.3.1; UPC 1303.4.1). Incorrect answer. Please choose another answer.

346.	When you dispatch a team of journeyman plumbers to install aspirators you will have to explain the type of installation that you want. In doing this you must identify the manner in which the waste will be discharged. Which of the following options must you include in your design?
		a. An air gap or vacuum breaker
		b. An air break or vacuum breaker
		c. An air gap
		d. An atmospheric backwater valve
You should design your system to discharge through an air gap. (UPC 1303.5). This is the only approved means of installation for a drainage connection to an aspirator. Incorrect answer. Please choose another answer.

347.	You are about to begin installing plumbing for a medical vacuum system. Before you begin work you must be sure that plans and specifications for an installation of a medical gas or medical vacuum system has been provided to the local code officer and approved prior to the installation.
		a. True
		b. False
True - The installation of medical gas or medical vacuum systems requires that plans and specifications be submitted to the local code enforcement officer. (IFGC 106.1; UPC 1304.3). Further, the code officer must approve the plans and specs and issue a permit before such systems can be installed. Incorrect answer. Please choose another answer.

348.	Mechanical engineers are normally the people who design medical gas systems. Once a permit is issued to a master plumber, certain requirements apply to the plumber's responsibilities. As a master plumber, you must know the protocol for the administrative side of installing medical gas systems. One of the responsibilities concerns record keeping. Where are the as-built plans and valve identification records to be kept during construction?
		a. In the mechanical engineer's office
		b. In the plumber's office
		c. On the job site
		d. In a safe accessible by the master plumber
The codes require as-built plans and valve identification records to be kept on the site where the piping is being installed. (IFGC 107.2; UPC 1304.5). The specifications and plans must be maintained at all times and be made available to authorized personnel as needed. Valve identification records can be of great importance during an emergency or if the need to work on an existing system arises. Incorrect answer. Please choose another answer.

349.	Of the following, who may install "Med Gas piping"?
		a. Apprentice
		b. Master plumber
		c. Individuals qualified under NFPA 99
		d. Journeyman plumber
		e. Both b and c
Only a master or journeyman plumber may install Med Gas if they have completed requirements set forth by NFPA 99 section 5.1.11.11. (UPC 1323.11.1). Incorrect answer. Please choose another answer.

350.	Aspirators are mandated to discharge to a sanitary drainage system through an air break.
		a. True
		b. False
False - Aspirators are required to discharge into a sanitary drainage system though an air gap, not an air break. (UPC 1303.5). An air gap discharge pipe is physically above the receptor the drain discharges into. This allows for any back up from the receptor drain away from the protected devise. Incorrect answer. Please choose another answer.

351.	When installing suction equipment in a dental office, what regulations do you refer to for required installation and equipment specifications?
		a. Local Health Department
		b. Mechanical Code
		c. Plumbing Code
		d. American Dental Associations Regulations
The plumbing code is the official regulation for dental equipment. Dental equipment requires water, air and other gases to be installed under the plumbing code regulations. Any appliance that has water and sewer connections fall under the plumbing code regulations. Incorrect answer. Please choose another answer.

352.	How should a sterilizer in a hospital be connected to a drainage system?
		a. A direct drain with a p-trap
		b. A separate line to a p-trap and the tank, with the p-trap to be vent separately through the roof.
		c. An indirect drain with a maximum developed length of 15 feet
		d. Directly and connected to the drainage system with a combination waste and vent
A sterilizer in a hospital must be connected to a drainage system with Indirect waste piping with a maximum developed length of 15 feet. (UPC 1303.4.1). The waste piping should have a drain equal to or larger than the pipe that exits a sterilizer in a hospital. Incorrect answer. Please choose another answer.

353.	Once a permit has been issued and an installation has been completed for a medical gas pipe installation, what is the responsibility of the plumber?
		a. To tag the lines and paint them with blue paint.
		b. To give the code official a copy of the medical gas piping specifications.
		c. To provide a notarized letter of completion to the owner with the installer name and license number.
		d. To provide the owner with as-built drawings that are to be kept on the job site.
All installation records must be furnished with as built drawings where piping and valves are located and kept on the job site for further references. (IFGC 107.2; UPC 1304.5). Incorrect answer. Please choose another answer.

354.	You are asked to install an aspirator. You are told that there will be bodily fluids collected as well. What type of trap must be used?
		a. A bell trap
		b. A p-trap with an air admittance valve
		c. A screen separator in connection with a running trap
		d. Collection bottle
Aspirators used for removing bodily fluids must be equipped with collection bottles or similar fluid traps. (UPC 1303.5). Incorrect answer. Please choose another answer.

355.	What safety precautions must be considered upon installing all oxygen systems?
		a. Backflow protection of oxygen and back flash of flame into the fuel gas supply
		b. Smoke and carbon monoxide protectors installed
		c. Three phase sprinkler head system
		d. All of the above.
A piping system must be provided with a protective equipment device designed to prevent not only backflow of oxygen into the flue gas supply, but also a flash back of flame into the gas supply. (NFPA 99:5.1.3.9.1.11; UPC 1309.11). Incorrect answer. Please choose another answer.

356.	What is the pressure required for testing a medical gas system when it is required to have a working pressure of 40 psi?
		a. 40 psi
		b. 50 psi
		c. not less than 150 psi
		d. not more than 80 psi
To test a medical gas system, when it is required to have a working pressure of 40 psi, you must use not less than 150 psi. (NFPA 99:5.1.1.2.2.3.4, 5.1.1.2.2.3.5; UPC 1324.5.1.1). Incorrect answer. Please choose another answer.

357.	What gases are the most common gases used in medical gas?
		a. Oxygen and nitrous oxide
		b. Oxygen and helium
		c. Carbon dioxide and nitrous oxide
		d. Helium and nitrous oxide
Oxygen and nitrous oxide are the two most common gases used in medical gas. It is used in medical gas, inhalation and anesthetic systems. High pressure nitrogen is used to operate tools. Incorrect answer. Please choose another answer.

358.	As you look through your code book you are seeking information on the storage of medical gases used in conjunction with plumbing connections between the gas containers and the equipment they serve. The special piping and storage system section of the plumbing code applies to any portable system and cylinder storage.
		a. True
		b. False
False - The plumbing code does not apply to portable systems or cylinder storage in the section based on special piping and storage systems. (IPC 1202.1; UPC 1301.2). Incorrect answer. Please choose another answer.

359.	The piping used in Med Gas OXY, MED and OXY/MED systems in connected by ______________.
		a. CPVC cement
		b. brazing
		c. lead-free solder
		d. PEX crimpings
Brazing is the method used to connect pipes and fittings in Med Gas and vacuum systems. (NFPA 99 5.1.10.11.11; UPC 1323.11). Incorrect answer. Please choose another answer.

360.	Tubing used in field installation for positive pressure Med Gas systems shall be made from the following:
		a. Type M copper
		b. Type L copper
		c. Type K copper
		d. All of the above
		e. Both b and c
Type L copper may be used for pressures under 185 psi and Type K shall be used for pressures exceeding 185 psi. Type M is not rated with sufficient psi for positive pressure use. (NFPA 99 5.1.10.1.4; UPC 1318.4). Incorrect answer. Please choose another answer.

361.	If the psi rating exceeds 185 psi in a positive pressure Med Gas system, what tubing is sufficient in rating to be installed?
		a. K copper
		b. M copper
		c. L copper
		d. Stainless steel tubing
K copper is the only grade of copper suitable for this pressure. (NFPA 99 5.1.10.1.4; UPC 1318.4). High pressure nitrogen is used to operate tools. Incorrect answer. Please choose another answer.

362.	Copper with a green stamp is used in a Med Gas system. What grade of copper does the color denote?
		a. M
		b. L
		c. K
		d. Both b and c
A green stamp denotes the heavier grade of K copper. (NFPA 99 5.1.10.1.7; UPC 1318.5). Incorrect answer. Please choose another answer.

363.	Copper used in Med Gas systems is identified by the manufacturer. If the stamp is blue, it denotes which grade of copper?
		a. M
		b. L
		c. K
		d. Both B and C
A blue stamp denotes Type L copper. (NFPA 99 5.1.10.1.7; UPC 1318.5). Incorrect answer. Please choose another answer.

364.	Vacuum tubing systems may be made of which of the following?
		a. Type L copper
		b. Type K copper
		c. Stainless steel tubing
		d. All of the above
All grades of copper (M, L, K and Stainless Steel) may be used for vacuum systems. (NFPA 99 1.10.2.1; UPC 1319.1). Incorrect answer. Please choose another answer.

365.	The brazing alloy used to bond pipe joints with fittings must exhibit a melting temperature in excess of ______________.
		a. 451°
		b. 600°
		c. 500°
		d. 1,000°
The melting temperature of the brazing alloy used to bond pipe joints must be in excess of 1,000° F or 538° C. (NFPA 99 5.1.10.4.1.1 - 5.1.10.4.1.3; UPC 1321.1). Incorrect answer. Please choose another answer.

366.	Vacuum main lines cannot be less than which of the following?
		a. 5/8" O.D.
		b. 7/8" O.D.
		c. 1/2" I.D.
		d. 7/8" I.D.
The minimum diameter pipe size permitted in vacuum main lines is 7/8" O.D. (NFPA 99 5.1.10.11.1.3; UPC 1323.1.1). Incorrect answer. Please choose another answer.

367.	While brazing copper-to-copper joints in a Med Gas system, you must constantly purge the system with __________________.
		a. Oxygen
		b. Air
		c. Nitrogen NF
		d. CO2
A constant flow of Nitrogen NF is needed to purge the system. (NFPA 99 5.1.10.4.5.1; UPC 1321.10). Incorrect answer. Please choose another answer.

368.	You are about to braze copper tubing in a Med Gas system. To clean the exterior surface of the copper tubing in your preparations, you must use which of the following?
		a. Steel wool
		b. Non-shedding abrasive pads
		c. Sand cloth
		d. Emory
Non-shedding abrasive pads must be used to clean copper tubing. All other materials are abrasive but leave residue. Surfaces must be wiped with a clean, lint-free white cloth. (NFPA 99 5.1.10.4.3.5; UPC 1321.8.3). Incorrect answer. Please choose another answer.

369.	Flux can only be used in the brazing process when:
		a. Brazing copper to brass
		b. Brazing copper to copper
		c. Not allowed
		d. Both a and b
Flux may only be to braze dissimilar metals. (NFPA 99 5.1.10.4.4.1; UPC 1321.9). Incorrect answer. Please choose another answer.

370.	When purging the Med Gas system of ambient air prior to brazing, the percent of oxygen concentration should be below:
		a. 2.5%
		b. 2.0%
		c. 1.0%
		d. 1.5%
Prior to brazing, the oxygen concentrator should read below 1.0%. (NFPA 99 5.1.10.4.5.5; UPC 1321.10.3). Incorrect answer. Please choose another answer.

371.	You have just finished cleaning the surfaces of copper tubing in a Med Gas system in preparation for brazing. The connections must be brazed within how many hours of cleaning?
		a. 12 hours
		b. 8 hours
		c. 24 hours
		d. 4 hours
Joints must be brazed within 8 hours after cleaning. (NFPA 99 5.1.10.4.3.13; UPC 1321.8.9). Incorrect answer. Please choose another answer.

372.	You are inspecting brazed joints and find one that is defective. Assuming that it is the type of joint that is permitted to be repaired, how many times can it be reheated before being replaced?
		a. Never
		b. Once
		c. Twice
		d. Unlimited
A defective brazed joint can be reheated only once for repair before it must be replaced. (NFPA 99 5.1.10.4.7.6; UPC 1321.12.4). Incorrect answer. Please choose another answer.

373.	The ambient temperature around a buried service trench or tunnel used to contain Med Gas piping is limited to what degree maximum?
		a. 120°
		b. 100°
		c. 130°
		d. 90°
130° is the maximum temperature permitted around the Med Gas piping system, indoors or out. (NFPA 99 5.1.10.11.3.3; UPC 1323.3.2). Incorrect answer. Please choose another answer.

374.	Where there is no potential from surface loads or conditions, the minimum cover over buried Med Gas piping is _________________.
		a. 18"
		b. 12"
		c. 36"
		d. 24"
If there is no potential for surface loads, 18" is the minimum cover permissible for buried Med Gas piping. (NFPA 99 5.1.10.11.5.5; UPC 1323.5.4). Incorrect answer. Please choose another answer.

375.	You are working on a project that includes installing backfill cover over buried Med Gas piping. The area where the work is being performed is expected to incur freezing and surface loads. The frost line is at 32". What is the minimum backfill cover that must be used over buried Med Gas piping in this situation?
		a. 18"
		b. 24"
		c. 33"
		d. 36"
Due to the conditions and surface loads, 36" is the minimum backfill cover in ditches containing Med Gas piping. (NFPA 99 5.1.10.11.5.5; UPC 1323.5.4). Incorrect answer. Please choose another answer.

376.	The method used to provide a source of drainage, aspiration and suction to remove body fluids is called:
		a. Source valve
		b. Medical-surgical vacuum
		c. Medical air
		d. Station outlet
The drainage, aspiration and suction of bodily fluids is removed into the vacuum system. Incorrect answer. Please choose another answer.

377.	The purge gas flow rate is controlled by using a _______________________.
		a. Pressure regulator
		b. Flow meter
		c. A combination of a and b
		d. All of the above
The purge gas flow is controlled (be by) a pressure regulator, a flow meter or a combination of both. (NFPA 99 5.1.10.4.5.3-.4; UPC 1321.10.2). Incorrect answer. Please choose another answer.

378.	Area alarm panels for Medical-surgical vacuum systems must indicate if the vacuum in the area drops below ______________________ mm gauge HgV.
		a. 200
		b. 280
		c. 300
		d. 320
If vacuum in the area drops below 300mm (or 12 inches) gauge HgV, the alarm will sound. (NFPA 99 5.1.12.4.10.4; UPC 1324.5.10.1). Incorrect answer. Please choose another answer.

379.	A qualified brazer is changing employers. The new employer is permitted to accept that brazer's qualification records if:
		a. The brazer has qualified following the same or equivalent procedure within the state of licensure and reciprocating states.
		b. The new employer obtains a copy of the brazer's performance record and he signs and dates these records accepting responsibility.
		c. Only if the brazer retests and requalifies.
		d. Both a and b
Both a and b are the conditions which permit the new employer to accept the brazer's qualification records. (NFPA 99 5.1.10.11.11.6; UPC 1323.11.5). Incorrect answer. Please choose another answer.

380.	The performance qualification of a brazer will remain in effect indefinitely, unless which of the following occurs?
		a. The brazer's qualifications remain in effect, no matter what
		b. There is a specific reason to question the brazer's ability.
		c. The brazer does not braze with the qualified procedure for three months.
		d. Both b and c
Unless there is a specific reason to question a qualified brazer's ability or the brazer does not braze for over six months with a qualified procedure, the brazer is considered qualified. (NFPA 99 5.1.10.11.11.7; UPC 1323.11.6). Incorrect answer. Please choose another answer.

381.	Which of the following does not apply to pipe labels marking Med Gas and vacuum systems?
		a. At intervals of not more than 10'
		b. At least once in, or above, every room
		c. Both sides of wall or partition penetrated by piping
		d. At least once in every story height on risers
Pipes may be labeled less than 10', but never more than 20' apart. (NFPA 99 5.1.11.1.4; UPC 1323.13.3). Incorrect answer. Please choose another answer.

382.	The chemical symbol for carbon dioxide is:
		a. C2
		b. CO2
		c. C2D2
		d. CD2
CO2 is the correct symbol, or label, for carbon dioxide. (NFPA 99 Table 5.1.11; UPC Table 1305.1). Incorrect answer. Please choose another answer.

383.	You are applying pipe labels to various pipes transporting Med Gas and vacuum lines within a system. Each gas or vacuum line has a specific color scheme for background/text which identifies itself. The proper label for the gas Helium will contain the following color scheme:
		a. Yellow/black
		b. Brown/white
		c. Black/white
		d. Blue/white
Brown/white is the correct label for Helium. (NFPA 99 Table 5.1.11; UPC Table 1305.1). Incorrect answer. Please choose another answer.

384.	The correct label for Nitrogen gas is _________________________.
		a. Yellow/black
		b. Brown/white
		c. Black/white
		d. Blue/white
Black/white is the correct label for Nitrogen. (NFPA 99 Table 5.1.11; UPC Table 1305.1). Incorrect answer. Please choose another answer.

385.	The correct label for instrument air is _________________________________.
		a. Black/white
		b. White/black
		c. Green/white
		d. Red/white
The correct label for instrument air is Red/White. (NFPA 99 Table 5.1.11; UPC Table 1305.1). Incorrect answer. Please choose another answer.

386.	Which of the following statements is not consistent with the code on labeling Med Gas pipe?
		a. A label may be made by stenciling.
		b. Adhesive markers may be used to label piping.
		c. Piping may be painted to identify it.
		d. The label shall identify the gas by name or chemical symbol.
Med Gas piping may not be painted under the codes. (NFPA 99 5.1.11.1.5; UPC 1323.13.4). Incorrect answer. Please choose another answer.

Water Heaters

387.	What device is commonly used to heat water for potable use?
		a. Space heater
		b. Hot water heater
		c. Tankless water heater
		d. Both b and c
All heating equipment that heats water for potable use is known as a hot water heater or a tankless water heater. Incorrect answer. Please choose another answer.

388.	When you install a water heater, you are required to obtain a permit and have your work inspected by a code officer upon completion. But, is a permit and inspection needed when you are merely replacing an existing water heater with a new one? The plumbing code requires _____________ when a water heater is simply being replaced in the exact location of the existing water heater.
		a. No permit
		b. A permit and inspection
		c. No permit, but does require a code officer to inspect the work
		d. A permit, but no code inspection of the work
The replacement of a water heater requires both a permit and a code inspection of the completed work. (IPC 105.1, 107.1; UPC 502.1; 502.2). Since water heaters can pose a health and safety risk if they are not installed and protected properly the code requires both a permit and a code inspection. Incorrect answer. Please choose another answer.

389.	A master plumber can ___________.
		a. Install water heaters without supervision
		b. Can send a licensed journeyman plumber to install water heater with indirect supervision
		c. Allow apprentice plumbers to assist in the installation of water heaters as long as the apprentice is supervised directly be either a journeyman or master plumber
		d. All of the above
Master plumbers have the authority under their license to install water heaters and other fixtures without supervision. However, a job that requires a permit still requires the inspection of a code officer. Journeyman plumbers work under the supervision of master plumbers but are not required to have direct supervision. Master plumbers can authorize apprentice plumbers to work with journeyman or master plumbers in the installation of all forms of plumbing. Incorrect answer. Please choose another answer.

390.	Imagine that you are called upon to install a water heater for a triplex rental property. The water heater will be used for domestic purposes. Which of the following is required for the satisfactory installation?
		a. An indirect waste and drain pan
		b. An indelibly stamped metal plate that is permanently attached to the water heater in a clear and conspicuous location that shows the maximum working pressure of the water heater
		c. Pipe insulation on the inlet and outlet piping that extends a minimum of 18 inches above the water heater
		d. All of the above
Water heaters and storage tanks for domestic hot water must have the fixture's maximum working pressure clearly and indelibly attached in a permanent manner to the fixture. This can be in the form of a metal plate that is attached to the metal tank. Any form of marking must be clear, indelible and installed for permanent placement. (IPC 501.7; UPC Table 501.1(1); UL 174 43.5). The most common means of this is a factory installed plate on the water heater. Incorrect answer. Please choose another answer.

391.	Third-party certification is required for all water heaters.
		a. True
		b. False
True - Water heaters must be third-party certified and should be installed in accordance with the manufacturer's recommendations. (UPC 501.5; UPC Table 501.1(1); UL 174, 45.1, 46.1). Incorrect answer. Please choose another answer.

392.	Water heaters and water-heating systems for domestic hot water are required to be equipped with _____________.
		a. Ball valves on the outlet piping
		b. An automatic temperature control
		c. Drain pans
		d. 1-inch diameter condensate drains for relief valves
When you are installing water heaters or water-heating systems for domestic hot water you must be sure that they are equipped with automatic temperature controls that are adjustable between the minimum and maximum allowable temperature ranges. (IPC 501.8; UPC 504.6). Incorrect answer. Please choose another answer.

393.	You are installing a low boy water heater in an attic. The owner wants to fit it into a space that affords 29" in height. Is this permissible under the code?
		a. Yes, low boys are designed for small, tight spaces.
		b. Yes, if the water heater is accessible from the front.
		c. No, a larger space is needed.
		d. No, water heaters are not permitted in an attic.
You will need a minimum distance of 30 inches in height to install a water heater in an attic. (IPC 502.3; UPC 508.4). The installation area must be both solid and level. There are also minimum requirements for both the width available for a water heater installation and the open area required in front of a water heater for servicing. Incorrect answer. Please choose another answer.

394.	When water heaters are installed in attics they are required to have a continuous solid floor in the exit area. What is the minimum required width of this floor?
		a. 24 inches
		b. 30 inches
		c. 36 inches
		d. 42 inches
The flooring provided in the exit area of a water heater installed in an attic is required to be no less than 24 inches wide. (IPC 502.3; UPC 508.4). Incorrect answer. Please choose another answer.

395.	You are hired to install a water heater in an attic. The owner has a specific place in the attic he wants it installed. To get to the location in the attic that the owner wants, one would have to travel 30 feet from the attic entrance along a 2 feet wide solid floor to the water heater. The height from the floor to the roof is 4 feet in height to hold the water heater. Would this be code compliant?
		a. Yes, as long as water heater unit is less than 4 feet in height.
		b. Yes, as long as the dimensions of the access door meet code.
		c. Yes, since there is enough room to move an appliance in and out.
		d. No.
The codes limit how far from an attic access door a water heater can be installed. A maximum length of 20 feet from the access door to the water heater measured along the center line of the passageway is required. (IPC 502.3; UPC 508.4.1). Incorrect answer. Please choose another answer.

396.	Vacuum breakers are to be installed in conjunction with the inlet piping that serves a bottom fed water heater.
		a. True
		b. False
True - Water heaters must be protected from back siphonage. This is done with the installation of a vacuum breaker in the inlet piping that supplies the water heater with cold water. (IPC 504.2; UPC 504.6). Normally a tee fitting is installed in the inlet riser. A short section of pipe extends horizontally and then turns 90 degrees to a vertical position where it extends six inches. A female adapter is installed on the riser and the vacuum breaker is screwed into the female adapter. This to prevent siphonage of the heater if a break occurs. Incorrect answer. Please choose another answer.

397.	A continuous solid floor is required as a service area or work platform for water heaters installed in attics. The service area or work platform is required to be level and must have a dimension of __________ inches in depth and width to allow for adequate servicing of the water heater.
		a. 24 x 24
		b. 30 x 30
		c. 36 x 36
		d. 42 x 42
The service area required for a water heater supplied in an attic is required to have minimum dimensions of 30 inches by 30 inches. (IPC 502.3; UPC 508.4.3). Incorrect answer. Please choose another answer.

398.	You are installing a water heater in an attic. Which of the following dimensions satisfy the clear access opening requirements for the removal of an attic-installed water heater?
		a. 20 inches by 24 inches
		b. 22 inches by 30 inches
		c. 28 inches by 28 inches
		d. 18 inches by 36 inches
Any water heater installed in an attic is required to have a clear access opening for the removal of the water heater. The minimum dimensions for this opening are 20 inches by 30 inches (IPC) and 22 inches by 30 inches (UPC). (IPC 502.3; UPC 508.4.). Incorrect answer. Please choose another answer.

399.	A water heater installed in an attic must have a passageway that includes a continuous solid floor from the entrance to the appliance. What is the required minimum width of the flooring?
		a. 20 inches
		b. 24 inches
		c. 30 inches
		d. 36 inches
The minimum width of the flooring required in the attic passageway is 24 inches. (IPC 502.3; UPC 508.4.2). Incorrect answer. Please choose another answer.

400.	Relief valves used on water heaters are installed to control thermal expansion.
		a. True
		b. False
False - Relief valves are not suitable for controlling thermal expansion. (IPC 504.4). The role of the relief valve is to protect against excessive pressure or temperature in a water heater. These valves are required to be of a self-closing type. Incorrect answer. Please choose another answer.

401.	What is the maximum allowable distance for an exit route in an attic for the removal of a water heater?
		a. 10 feet
		b. 15 feet
		c. 20 feet
		d. 30 feet
The maximum allowable distance for an exit route installed for the removal of a water heater in an attic space is 20 feet. (IPC 502.3; UPC 508.4.1). Incorrect answer. Please choose another answer.

402.	The installation of an electric water heater requires which of the following to be in close proximity to the fixture?
		a. An ABC-type fire extinguisher
		b. An electrical disconnect switch that is dedicated to only the water heater
		c. A ventilation fan
		d. A minimum of two light sources to allow for service work to be completed
		e. Both a and b
A dedicated electrical disconnect switch is required to be installed in close proximity to any electric water heater. (IPC 504.3). Gas-fired and oil-fired water heaters require the installation of approved cutoff valves installed on the fuel piping in close proximity to the water heater. Incorrect answer. Please choose another answer.

403.	The installation of a water heater requires some specific types of equipment. A water heater cannot be installed with _____________.
		a. A temperature or pressure relief valve affixed to it
		b. A cutoff valve on the inlet pipe that utilizes washers to stop the flow of water
		c. A vacuum breaker on the inlet water pipe
		d. A plastic drain pan
Cutoff valves installed on the inlet piping of water heaters have to be of a positive-sealing type. Both gate valves and ball valves are acceptable. It is not acceptable to install a stop-and-waste valve on the inlet piping of a water heater. No valve that depends on washers to stop water flow are allowed as main cutoff valves on water heaters. Incorrect answer. Please choose another answer.

404.	Discharge piping connected to a relief valve may terminate with a threaded end.
		a. True
		b. False
False - Threads cannot be applied on the termination end of a discharge pipe from a relief valve. (IPC 504.6). If threads exist there is a risk that a cap will be installed on a dripping discharge pipe. This renders the relief valve useless and creates a health and safety concern. Incorrect answer. Please choose another answer.

405.	What is the maximum depth below the top of a water heater that a temperature and pressure relief valve can be installed?
		a. 6 inches
		b. 8 inches
		c. 10 inches
		d. 12 inches
The maximum allowable depth below the top of a water heater for the probe of a temperature and pressure valve to be installed is six inches. (IPC 504.4.1; UPC Table 501.1; UL 174, 23.3). Temperature and pressure relief valves can be installed on either the top or the side of a water heater. The location of the valve is determined by the tapped fitting built into the water heater that will accept the relief valve. Incorrect answer. Please choose another answer.

406.	What is the maximum allowable distance between the termination end of a discharge tube from a relief valve and the surface of a finished floor?
		a. 4 inches
		b. 6 inches
		c. 8 inches
		d. 12 inches
A pipe that conveys the discharge from a relief valve installed on a water heater is required to terminate no more than six inches above a finished floor. (IPC 504.6; UPC Table 501.1.(1); UL 174, 46.1). This is to minimize the risk of personal injury to anyone in the vicinity if a relief valve opens and discharges a stream of hot water. Incorrect answer. Please choose another answer.

407.	You are installing an electric water heater in an attic. This type of installation requires the installation of a drain pan under the water heater. You must determine the required depth of the pan that will be installed. Which of the following is the correct minimum depth for such a pan?
		a. 1 inch
		b. 1.25 inches
		c. 1.5 inches
		d. 2 inches
The minimum allowable depth of a drain pan for a water heater is 1.5 inches. (IPC 504.7.1; UPC 507.5). Drains provided for drain pans are to run to a point of termination without any reduction in pipe sizing. The drain can terminate over a suitably located indirect waste receptor or floor drain. If these discharge points are not available, the piping can be extended to the outside of a building where it will terminate not less than six inches from ground level and not more than twenty-four inches above ground level. Incorrect answer. Please choose another answer.

408.	The code requires that all discharge from a relief valve on a water heater to be installed in such a way that it can observed by occupants in the building that houses the water heater.
		a. True
		b. False
True - Discharge tubing from a relief valve on a water heater must be installed in a manner that allows it to be observed by occupants of a building. (IPC 501.4; UPC 608.5). What is the reason for this? Relief valves develop leaks. If left undiscovered these leaks could lead to problems and property damage. When the piping can be seen, any leaks can be detected with a simple visual inspection and a dripping relief valve can be replaced. Incorrect answer. Please choose another answer.

409.	What type of water valve should be installed on a water heater?
		a. Check Valve
		b. Stop and Waste Valve
		c. Full Port Valve
		d. Needle Valve
Only a full port valve can be used on a water heater on the cold inlet side of the water piping. (IPC 503.1). Incorrect answer. Please choose another answer.

410.	All water heaters must be ______ by a third- party.
		a. inspected
		b. certified
		c. licensed
		d. installed
All water heaters must be third party certified to the specifications and standards that the water heater must comply with. (UPC 501.5; UPC Table 501.1(1); UL 174, 45.1, 46.1). Plumbers have no authority or training to "certify" the construction of a water heater. Manufacturers have the knowledge of the product and quality control but cannot certify their product and say it's safe because of a conflict of interest. Same with wholesalers who buy from certain manufacturers based on cost. As with all plumbing products, certifications of quality and safety are determined by third party testing agencies such as A.S.T.M. or A.N.S.I. or other "third party" testing agencies that are independent from manufacturers, wholesalers, or buyers. Incorrect answer. Please choose another answer.

411.	Hot water supplied to a fixture must be located on ___________.
		a. the left side
		b. the right side
		c. either side as long as it's clearly marked
		d. The code does not address the side that hot is to be located on.
The hot water supplied to any fixture shall be installed on the left side. (IPC 607.4; UPC 417.5). This is not only by code regulation, but nationwide acceptable practice on all plumbing installation. Incorrect answer. Please choose another answer.

412.	Pressure relief valves on water heaters must bear a label from an approved agency and have a pressure setting not to exceed __________.
		a. 100 psi
		b. 150 psi
		c. 200 psi
		d. 250 psi
A pressure relief valve must have a pressure setting not exceeding the tank or water heater manufacturer's rated working pressure or 150 psi, whichever is less. (IPC 504.5; UPC 504.5). Incorrect answer. Please choose another answer.

413.	You are installing a water heater in a basement. What size working space is required in front of the hot water heater to service it and to access the controls?
		a. 30 inches x 30 inches
		b. 35 inches x 30 inches
		c. 42 inches x 42 inches
		d. 48 inches x 42 inches
Water heaters have to be installed on a level base having a working space in front of the heater of 30 inches and 30 inches in length to service the water heater. (IPC 502.5). Incorrect answer. Please choose another answer.

414.	You are installing a tankless water heater in a residence. What is the maximum temperature it can use?
		a. 100 degrees F
		b. 120 degrees F
		c. 140 degrees F
		d. 180 degrees F
All tankless water heaters cannot exceed 140 degrees F when used for domestic or residential use. (IPC 501.6). Incorrect answer. Please choose another answer.

415.	What can happen when water is provided at a temperature over 120 degrees F to bathtubs and showers?
		a. Burning or scalding of the human body can occur.
		b. The water heater relief valve will start dripping out of the overflow due to the rise in internal tank pressure.
		c. The excessive heat can cause the temperature control valves to malfunction, which can break the o-rings by expansion
		d. If CPVC or Pex piping is used, it can cause the joints to expand and burst
Water that is at or above 120 degrees F is too hot for human use for bathing. It can cause the burning and scalding of the body, and possibly a stroke due to the high temperature. The codes limit the temperature of water for bathtubs and showers to 120 degrees. (IPC 412.3; UPC 409.4). Most states require anti-scald valves at showers. Incorrect answer. Please choose another answer.

416.	Which residential fixtures require hot water?
		a. Sillcocks and hose bibs
		b. Water closets, water softeners and RO units
		c. Kitchen and laundry faucets
		d. All of the above.
Hot water is required for cooking, washing and laundry. (IPC 607.1; UPC 417.5). Sillcocks, water closets, and individual hose bibs do not require a hot water supply. Water softeners and RO units can only be connected to the cold water supply piping. Incorrect answer. Please choose another answer.

417.	You are installing a water heater which is also being used as a space heater. In order to comply with Code, and limit the water temperature of the potable hot water distribution system, you must install which of the following?
		a. Check valve
		b. Master thermostatic mixing valve
		c. Hot water limit switch
		d. Backflow preventer
The thermostatic mixing valve must be installed to prevent the temperature of potable hot water distribution from exceeding 140°. (IPC 501.2). Incorrect answer. Please choose another answer.

418.	You are installing a pipe sleeve to provide combustion air using the one permanent opening method to an enclosure containing a water heater with a 36,000 Btu rating. This opening will directly communicate to a space that freely communicates with the outdoors. Using the formula of one square inch per 3,000 Btu/h required, what is the minimum size pipe needed?
		a. 3"
		b. 4"
		c. 6"
		d. 8"
One square inch of free area per 3,000 Btu/h input rating is the minimum needed. (IFGC 304.6.2; UPC 506.4.2). 36K Btu requires 12 square inches of free area. To convert 12 square inches to area of round pipe, you must use formula πr2 to determine the area of a circle. A 4" diameter pipe has radius = 2"2. 4" x 3.14 = 12.56 square inches. Incorrect answer. Please choose another answer.

419.	With respect to the free area of the opening needed to supply combustion air to a water heater, the required volume of combustion air must not be less than:
		a. 50 cubic feet per 1,000 Btus
		b. 40 cubic feet per 1,000 Btus
		c. 50 cubic feet per 500 Btus
		d. 40 cubic feet per 500 Btus
50 cubic feet per 1,000 Btus is the minimum volume of combustion air needed. (IFGC 304.5.1; UPC 506.2.1). Incorrect answer. Please choose another answer.

420.	The minimum free area allowed for combustion air in an enclosure containing a gas water heater is:
		a. 50 square inches
		b. 100 square inches
		c. 108 square inches
		d. 120 square inches
100 square inches is the minimum free area required and may require more, depending on Btu rating. (IFGC 304.5.3.1; UPC 506.3). Incorrect answer. Please choose another answer.

421.	You are installing a pipe sleeve to provide combustion air using the one permanent opening method to an enclosure containing a water heater with a 60,000 Btu rating. This opening will directly communicate to a space that freely communicates with the outdoors. Using the formula of one square inch per 3,000 Btu/h required, what is the minimum size pipe needed?
		a. 6"
		b. 5"
		c. 4"
		d. 3"
One square inch of free area per 3,000 Btu/h input rating is the minimum needed. (IFGC 304.6.2; UPC 506.4.2). A 60K Btu heater requires a minimum free area of 20 square inches. A 5" pipe sleeve gives 19.62 square inches and a 6" pipe sleeve gives 28.26 square inches. A 6" inch pipe has a radius of 3". 3"2 = 9" 9" x 3.14 = 28.26 inches. Incorrect answer. Please choose another answer.

422.	Relief valves shall not be discharged to which of the following:
		a. Outside the structure
		b. Indirect drain
		c. Drip pan
		d. Both b and c
Relief valves shall not be discharged into a drip pan. (IPC 504.6; UPC 507.5). Incorrect answer. Please choose another answer.

423.	Where gas water heaters are installed in residential garages, they shall be elevated a minimum of _________________ AFF.
		a. 6"
		b. 12"
		c. 18"
		d. 24"
The codes direct the plumber to install water heaters no less than 18" above the floor. (IFGC 305.3; UPC 507.13). Incorrect answer. Please choose another answer.

424.	In multi-story vent installations, vertical common vents for category 1 appliances must be what type of gas vent material?
		a. Type B
		b. Single wall galvanized steel
		c. PVC
		d. Type L
Only Type B gas vent material is permitted to be used for vertical common vents in multi-story vent installations. (IFGC 501.13, Table 503.4; UPC Table 509.4). Incorrect answer. Please choose another answer.

425.	At minimum, how many feet above a draft hood or flue collar should a Type B vent terminate?
		a. 3'
		b. 1'
		c. 4'
		d. 5'
Type B vent should terminate 5' above a draft hood or flue collar. (IFGC 503.6.6; UPC 509.6.1) Incorrect answer. Please choose another answer.

426.	Gas tankless water heaters typically require _________ Btu/h input than tank-type domestic water heaters.
		a. less
		b. greater
		c. the same
		d. similar
Because tankless heaters heat water on demand and have no heated reserve water, they demand greater Btu input to heat water rapidly. Incorrect answer. Please choose another answer.

427.	Which of the following is not required to be installed on top fed tank type and tank less water heaters?
		a. Pressure relief valve
		b. Cold water inlet shut off valve
		c. Vacuum relief valve
		d. Fuel source shut off valve
Bottom fed water heaters and bottom fed storage tanks connected to water heaters require a vacuum relief valve. Incorrect answer. Please choose another answer.

428.	A vent from a gas water heater passes through an insulated assembly. What is required to be installed as a protective measure?
		a. Insulation shield
		b. Draft Hood
		c. Draft Control Device
		d. Cleanout
Where a vent passes through an insulated assembly, an insulation shield must be installed between the vent and the insulation. (IFGC 502.4; UPC 509.6.1.1). The shield must be made of 26-gauge metal. The vent needs to terminate not less than 2 inches above the insulation and be secure in place to prevent displacement. Incorrect answer. Please choose another answer.

429.	All of the following are requirements for discharge piping serving a relief valve, except:
		a. Must not be directly connected to a drainage system
		b. Must not have a threaded end
		c. Must be trapped
		d. Must not be smaller than the diameter of the valve outlet
Relief valve discharge piping should not be trapped. (IPC 504.6). Incorrect answer. Please choose another answer.

430.	You have been sent to install a tankless water heater in a newly constructed residence. The Code does not cover the installation issue you have on a tankless heater. In this situation, you should ____________________.
		a. ask your Master Plumber for help
		b. use manufacturer's instructions
		c. call the city plumbing inspector
		d. consult the Code book
Manufacturer's instructions take precedence where Codes or city officials may have limited knowledge or information on a particular manufacturer's equipment. (IPC 502.1; UPC 501.1). Incorrect answer. Please choose another answer.

431.	Which of the following is required to install a gas water heater in a bedroom closet?
		a. Gasketed door assembly
		b. Door with self-closing device
		c. A gas water heater is not permitted to be installed in a bedroom closet.
		d. Both a and b
Gas water heaters are not permitted to be installed in bedroom closets unless the closet door is gasketed or equipped with a solid-weather-stripping and has an approved or listed self-closing device. (IFGC 303.3; UPC 504.1). Incorrect answer. Please choose another answer.

432.	Which of the following is not required to be installed by a plumber on an instantaneous tankless gas water heater that is to sanitize dishes?
		a. Vent
		b. T&P valve
		c. Inlet shut-off valve
		d. Gas shut-off valve
Some gas tankless water heaters are installed on exterior walls in recessed cans which vent directly to the atmosphere. (IFGC 501.8). Incorrect answer. Please choose another answer.

433.	You plan on installing an exterior tankless water heater (100,000 btu/hr) beside a window which opens. What is the minimum lateral distance required between the window and the heater, upon installation?
		a. 18"
		b. 24"
		c. 6"
		d. 12"
A minimum lateral distance of 12" would be required between a window and an exterior tankless water heater. (IFGC Table 503.8; UPC Table 503.8). Incorrect answer. Please choose another answer.

434.	The minimum distance allowed from the top of an exterior tankless water heater and the soffit above it is_________.
		a. 24"
		b. 27"
		c. 30"
		d. As specified by appliance manufacturer
The minimum distance allowed from the top of an exterior tankless water heater and the soffit above it is to be installed as specified by the appliance manufacturer. (IFGC Table 503.8; UPC Table 503.8). Incorrect answer. Please choose another answer.

435.	Your job requires that you remove an existing tank-type water heater with a 40,000 Btu rating and replace it with a tankless heater with a 199,000 Btu rating - which will exceed the maximum Btu load. How might you compensate for the increase in Btus in the most efficient, cost-effective, manner?
		a. Run a larger branch line to the water heater
		b. Increase the psi at the regulator
		c. Tap into gas lines before the regulator, and install another regulator at the heater.
		d. Either b or c
Increasing the diameter brand line does not lower the demand of the new heater. Tapping into the gas line before the regulation will not affect the present Btu gas level but another regulator will be required downstream at the new heater. Increasing the p.s.i. will require regulators at all existing and new appliances but may be as cost-effective as tapping into an existing line before the regulator. Incorrect answer. Please choose another answer.

436.	A chimney has a factory-built flue. Can a gas water heater be connected to the chimney flue as an exhaust for combustion gases?
		a. Yes
		b. Only if the water heater is under a certain btu
		c. Only if the flue is listed for such an installation
		d. No
A gas water heater may be connected to a chimney with a factory-built flue only if the flue is listed for such an installation. (IFGC 503.5.1; UPC 509.5.1). Incorrect answer. Please choose another answer.

Recycling Gray Water

437.	Recycled gray water can be used for ____________.
		a. laundry tub faucets
		b. lavatories
		c. subsurface landscape irrigation
		d. Both b and c
The recycling of gray water is governed by the plumbing code and the procedures are becoming more popular and more critical. Gray water can be used to flush toilets and urinals. (IPC 1302.6.1; UPC 1505.1). Subsurface landscape irrigation systems may also be supplied by gray water. (IPC 1302.11; UPC 1505.1). This reduces the demand on potable water and thereby extends the existing reserves of potable water. This can be particularly important in some regions of the country that experience water shortages. Incorrect answer. Please choose another answer.

438.	Which of the following types of materials are approved for the construction of collection reservoirs for gray water?
		a. Corrosion resistant materials
		b. Nonabsorbent materials
		c. Durable materials
		d. All of the above
Collection reservoirs are used to hold gray water until it will be used. (IPC 1301.9.2; UPC 1503.9). These reservoirs must be constructed of approved materials. Some collection reservoirs are manufactured and sold. Others are built on site. The reservoirs are required to be made from materials that are corrosion resistant, nonabsorbent and durable. Additionally, the reservoirs are to be closed and sealed with gas-tight covers. You must provide an access opening that will allow for interior inspections of the collection reservoir. Incorrect answer. Please choose another answer.

439.	Assume that you are plumbing an inlet for gray water into a collection reservoir. You must be aware of the requirements for the installation. Which of the following will you be required to install in the piping system?
		a. A filter
		b. A pressure gauge
		c. A globe valve
		d. A water gauge
Piping that delivers water to a gray water reservoir must be fitted with a full-open valve and a filter that will filter all water entering the reservoir. (IPC 1302.5; UPC 1506.10.5). Incorrect answer. Please choose another answer.

440.	The collection of gray water can come from which of the following plumbing fixtures?
		a. Shower
		b. Bidet
		c. Kitchen sink
		d. Dishwasher
The shower is the only option in this scenario allowed to be used for the collection and recycling of gray water. Other types of fixtures that are allowed for the collection of recycling gray water include the following: • Bathtubs • Lavatories • Clothes washers • Laundry trays (IPC 202; UPC 209). Incorrect answer. Please choose another answer.

441.	Gray water that enters a collection reservoir must be ________.
		a. Filtered
		b. Filtered and flow controlled
		c. Filtered and monitored
		d. Filtered and measured
All gray water entering a gray water collection reservoir is required to be filtered. (IPC 1302.5; UPC 1506.10.5). Gray water is not meant to be pure. However, it should not contain solids. Unfiltered water can contain solids. For this reason, all gray water must be filtered to remove solids before it is delivered to a final collection point. Incorrect answer. Please choose another answer.

442.	Potable water may be connected to a non-potable water source under what condition?
		a. If the potable water is used as make up water.
		b. If there's an emergency.
		c. If the potable water is marked red.
		d. It is not permitted.
When there is a risk of inadequate gray-water supply, potable water can be used makeup water. (IPC 1301.9.4; UPC 1505.4). Any water supply that delivers potable water to a gray water system must be protected by a backwater preventer. (IPC 1301.9.4; UPC 1505.4). Incorrect answer. Please choose another answer.

443.	Overflow pipes are required to be installed on every gray-water collection reservoir. As a working plumber you must demonstrate the ability to size this overflow pipe. For this example, assume that the discharge pipe conveying gray water to a collection reservoir has a 3-inch diameter and the maximum capacity of the water supply line to the tank is 150-200 gallons per minute. What is the minimum diameter of an overflow pipe that you must install?
		a. 1.5 inches
		b. 2 inches
		c. 3 inches
		d. 4 inches
Under the UPC, the overflow pipe must have a minimum diameter that is equal to the discharge pipe that is emptying into a gray water collection reservoir. (UPC 1503.9.1(6)). Under the IPC, the size of the overflow pipe depends on the maximum capacity of the water supply line to the tank. (IPC Table 606.5.4, 1301.9.5). An overflow pipe can be larger than the discharge pipe, but this is not a requirement. Incorrect answer. Please choose another answer.

444.	Gray water collection reservoirs are required to be ___________.
		a. Vented
		b. Trapped
		c. Provided with vapor barrier venting
		d. Cleaned monthly
Gray water collection reservoirs are required to be vented. (IPC 1301.9.7; UPC 1503.9.1). The vent is required to extend to open air. Gray water is not supposed to contain black water that would contain methane gas. But to be safe, the reservoirs are required to be vented. Incorrect answer. Please choose another answer.

445.	All gray water systems are required to be fitted with bypass or diverter valves. This drain is required to discharge to the _____________.
		a. catch basin
		b. gravel bed for dissipation into approved soil
		c. sanitary drainage system
		d. Any of the above
Drains for gray water collection systems are required to be connected to the sanitary drainage systems. (IPC 1302.8.1; UPC 1503.2.2). It is done by a bypass valve or diverter, upstream of the storage tank. It allows for the inspection or servicing of the system. Incorrect answer. Please choose another answer.

446.	What type test is used to determine the permeability of the soil for a proposed absorption system?
		a. Smoke test
		b. Percolation test
		c. Head test
		d. Pressure test
A percolation test is used. A test hole is to be dug or bored 4"-8" in diameter. The bottom of the hole is scratched to loosen the natural soil. 2" of gravel is then added to the bottom. Water is then added to 12" above the bottom. The time for the water to seep away is the general idea of the test. Incorrect answer. Please choose another answer.

447.	You are installing an irrigation disposal field from a gray water reservoir. What is the minimum horizontal distance that must be between the absorption area and building?
		a. 2'
		b. 3'
		c. 4'
		d. 5'
2' from the building is the minimum horizontal distance required of the disposal field of an absorption system. (IPC Table 1402.3; UPC Table 1503.4). Incorrect answer. Please choose another answer.

448.	Gray water discharge is estimated based on:
		a. gallons per minute
		b. gallons per day
		c. gallons per week
		d. daily demand at peak loads
Gray water discharge is based on the gallons of use per day per number of occupants based on the type of fixtures connected to a system. This is derived by use of an equation. The equation is as follows: C = A x B A = the number of occupants B = estimated flow demands per occupant C = estimated gray water discharge based on the total number of occupants (IPC 1402.1; UPC 1503.8). Incorrect answer. Please choose another answer.

449.	You are designing the work procedures for your plumbers who will be working on a seepage trench. Your plan requires the plumbers to rough up the bottom of the trench and loosen all the dirt in the bottom of the trench. Your plumbers complain that this work is not necessary. Is it true that the ground in the bottom of seepage trenches and beds is required to be loosened?
		a. True
		b. False
True - The bottom of seepage trenches and beds are required to be scarified. (IPSDC 605.4; UPC Appendix H 601.2). In other words, the dirt has to be scratched or roughed up so that it is not compacted. This enhances the ability of the trench or bed to absorb liquids. Any loose material created from the scarifying process should be removed. Incorrect answer. Please choose another answer.

450.	Untreated gray water is not allowed to be held in reserve for long periods of time. Assume that you are working with a gray water system where toilets and urinals will be flushed with gray water. How long can untreated gray water remain in a reservoir before it is used?
		a. 12 hours
		b. 24 hours
		c. 36 hours
		d. 72 hours
Untreated gray water that will be used to flush toilets or urinals can be retained in a collection reservoir for up to 24 hours. (IPC 1302.6). This must be taken into account when computing the amount of reserve water that will be available for flushing purposes. The sizing of a gray water system is dependent on the cycling of water entering and exiting a collection reservoir in a 24-hour period. Incorrect answer. Please choose another answer.

451.	There are a limited number of disinfectants that can be used to disinfect gray water that will be used for flushing toilets and urinals. Which of the following would you, as a master plumber, authorize the use of for disinfection of gray water to flush toilets and urinals?
		a. Chlorine
		b. Ozone
		c. Charcoal filtering
		d. Either a or b
You may use chlorine or ozone to disinfect gray water that will be used for the flushing of toilets or urinals. (IPC 1301.2.1; UPC 1506.10.2). No other type of disinfectant is approved by the plumbing code for this purpose. Incorrect answer. Please choose another answer.

452.	Water treatment is not required for gray water used for irrigation. Why is this the case?
		a. It would be harmful to any vegetation.
		b. Too much moisture would flood the area.
		c. The treatment process would cause the plant to grow too large.
		d. The cost to treat the gray water would be astronomical.
The chemicals used in disinfection would be detrimental to the vegetation. Incorrect answer. Please choose another answer.

453.	What color dye are you required to use to identify water as gray water?
		a. Blue
		b. Green
		c. Red
		d. None of the above.
Gray water no longer is required to be dyed. (IPC 1401.6). Under previous codes, it was to be dyed blue or green before it could be reintroduced into a plumbing system. Incorrect answer. Please choose another answer.

454.	You are designing a plumbing system that will utilize recycled gray water for irrigation purposes. This particular system is a subsurface irrigation system. Before you can determine a suitable location, you need to establish certain criteria. For example, assume that the property will receive potable water from well water. When this is the case, the irrigation system cannot be installed at an elevation higher than the surface grade of any potable water well.
		a. True
		b. False
True - Subsurface irrigation systems are to be installed below potable water wells. (IPC 1301.11; UPC 1502.4). If you are irrigating land that is adjoined by another owner's land that has a water well on it, the irrigation system must not be installed above the well on the adjoining property. The key is to prevent any potential contamination from an irrigation system entering a potable water surface. Incorrect answer. Please choose another answer.

455.	You are installing a gray water adsorption field. Nearby is a water well. At a minimum, how far away from the water well does the gray water absorption disposal field need to be to be code compliant?
		a. 50'
		b. 100'
		c. 150'
		d. 200'
The minimum horizontal distance between a gray water absorption disposal field to a water well is 100'. (IPC Table 1402.3; UPC Table 1503.4). Incorrect answer. Please choose another answer.

456.	The bottom of a seepage trench or bed excavation shall:
		a. Have a slope of 1/4" per foot
		b. Be level
		c. Have a 1/8" per foot slope
		d. Both a and c
The bottom of seepage trenches or beds shall be level. (IPSDC 1403.1.4; UPC Appendix H 601.9). Incorrect answer. Please choose another answer.

457.	Why type of dye can be used when coloring gray water to meet the requirements of the plumbing code?
		a. Food-grade vegetable dye
		b. Clothing dye
		c. Certified plumbing dye
		d. None of the above.
Gray water no longer is required to be dyed. (IPC 1401.6). Under previous codes, it was to be dyed blue or green before it could be reintroduced into a plumbing system, using food-grade vegetable dye. Incorrect answer. Please choose another answer.

458.	There could be a time when a gray water reservoir capacity would be inadequate to meet the demands on it for flushing toilets or urinals. To compensate for this risk, you must ___________.
		a. Install back-up gray water reservoirs when this risk is reasonable to assume possible.
		b. Provide supplemental potable water to the gray-water system for emergency use.
		c. Install audible alarm systems on all fixtures dependent on the system
		d. Reduce the number of toilets or urinal specified to be installed.
If you suspect that there could be a time when the proposed gray water reservoir will be inadequate for the flushing needs of toilets or urinals, you should install a supplemental water supply of potable water to assist in the flushing requirements. (IPC 1301.9.4; UPC 1505.4). Water supplies that serve gray water systems must be protected by a backwater preventer. (IPC 1301.9.4; UPC 1505.4). Incorrect answer. Please choose another answer.

459.	What color dye is required when dying gray water that will be used for subsurface landscape irrigation?
		a. Blue
		b. Green
		c. Red
		d. None of the above
You are not required to dye gray water used in subsurface irrigation systems. (IPC 1401.6). Incorrect answer. Please choose another answer.

460.	A gray water irrigation reservoir is required to have a supplemental water supply to protect against the reservoir running dry.
		a. True
		b. False
False - No supplemental water supply is required for an irrigation reservoir with gray water. If an irrigation reservoir runs dry it is not a concern to the plumbing code. Incorrect answer. Please choose another answer.

461.	What special regulations apply to water piping that conveys and distributes recycled gray water?
		a. The pipe must not be made of CPVC piping.
		b. The pipe must be fitted with air chambers.
		c. The pipe must be identified as non-potable water in an approved manner.
		d. The pipe is not allowed to be fitted with boiler drains.
Plumbers are required to identify all piping that contains gray water as non-potable water piping. (IPC 608.9.2; UPC 601.3.3). The markings must be of an approved type. They are exposed, obvious, indelible and permanent. Incorrect answer. Please choose another answer.

462.	Does the nonpotable water piping need to be stamped with any warning?
		a. No.
		b. Yes, "CAUTION: DO NOT DRINK"
		c. Yes, CAUTION: NONPOTABLE WATER, DO NOT DRINK".
		d. Yes, "NONPOTABLE WATER"
Nonpotable distribution piping needs to be embossed, stamped or marked "CAUTION: NONPOTABLE WATER, DO NOT DRINK." (IPC 608.9.2; UPC 601.3.3). Incorrect answer. Please choose another answer.

463.	Soil testing by an approved authority is required for any site that will accommodate a seepage bed or trench.
		a. True
		b. False
True - Ground used to accept the discharge associated with a seepage bed or trench must be tested prior to any installation of a seepage trench or bed. (IPSDC 404; UPC 1504.3, Appendix H 401). The test must be done by an approved authority to determine the perk rate of the soil. An acceptable perk rate must be present to allow the installation of a seepage trench or bed. Incorrect answer. Please choose another answer.

464.	Seepage trenches are used in conjunction with some irrigations systems. When this is the case, the trenches must have a minimum width of ________.
		a. 6 inches
		b. 12 inches
		c. 24 inches
		d. 36 inches
Seepage trenches are required to have a minimum width of 12 inches. (IPSDC 201; UPC Appendix H 301). Incorrect answer. Please choose another answer.

465.	You are installing a gray water irrigation disposal field. A stream runs into a lake near the owner's home. At a minimum, how far from the stream and lake must the disposal field be placed?
		a. 100'
		b. 75'
		c. 50'
		d. 20'
50' is the minimum horizontal distance from streams or lakes to a gray water irrigation disposal field. (IPC Table 1402.3; UPC Table 1503.4). Incorrect answer. Please choose another answer.

466.	In subsurface irrigation systems, what is the minimum depth of the aggregate placed above the drain piping?
		a. 1 inch
		b. 2 inches
		c. 3 inches
		d. 6 inches
A minimum of two inches of aggregate must be placed on top of the piping in subsurface irrigation systems. (IPC 1403.1.5; UPC Table 1504.7.3). Incorrect answer. Please choose another answer.

467.	Distribution piping in a seepage trench or bed is required to have a minimum diameter of ____?
		a. 1.5 inches
		b. 2 inches
		c. 3 inches
		d. 4 inches
Distribution piping in a seepage trench or bed must have a minimum diameter of three inches. (IPC 1403.2; UPC 1504.7.1). The piping must be large enough to handle the maximum anticipated load on a bed or trench. It is common to use 4-inch pipe during the construction of seepage trenches and beds, but a 3-inch pipe can be used when the demands on the system will not overload the piping. Incorrect answer. Please choose another answer.

468.	A seepage trench used in conjunction with an irrigation system can extend up to __________ feet in length.
		a. 25
		b. 50
		c. 75
		d. 100
Seepage trenches can extend up to 100 feet in length. (IPC 1403.1.2; UPC Table 1504.7.3). Incorrect answer. Please choose another answer.

469.	You are constructing a subsurface irrigation system in a back yard that has a slope. Which of the following slopes are within the maximum limits for the grade of distribution piping in a nonpotable water subsurface irrigation system?
		a. 2" per 100 feet
		b. 3" per 100 feet
		c. 5" per 50 feet
		d. Both a and b
The slope of distribution piping in gray water subsurface irrigation systems cannot exceed 3" per 100 feet (UPC) or 4" per 100 feet (IPC). (IPC 1403.2; UPC Table 1504.7.3). Incorrect answer. Please choose another answer.

470.	You are spacing out the subsurface irrigation piping into lines of pipe and initially place the piping two feet apart. What distance from center to center of the piping complies with the code?
		a. 1' apart
		b. 2' apart
		c. 4' apart
		d. 6' apart
When constructing a subsurface irrigation system, the piping should be evenly spaced and be no closer than 3 feet (IPC) or 4 feet (UPC) apart. (IPC 1403.1.3; UPC Table 1504.73.). The piping should not be spaced more than five feet apart. (IPC 1403.1.3.). Incorrect answer. Please choose another answer.

471.	What is the maximum size of aggregate allowed to backfill a seepage trench?
		a. 1 inch
		b. 1.5 inches
		c. 2 inches
		d. 2.5 inches
The maximum size of aggregate allowed to backfill a seepage trench is 2 ½". (IPSCD 605.5; UPC Appendix H 601.2). Incorrect answer. Please choose another answer.

472.	What is an acceptable use of recycled gray water?
		a. Water closets
		b. Urinals
		c. Both a and b
		d. Neither a nor b
Gray water that does not contain waste particles may be used to flush water closets and urinals. (IPC 1302.6.1; UPC 1505.1). Incorrect answer. Please choose another answer.

473.	Can lavatories and sinks drain into gray water drainage systems?
		a. No, it must be connected to a public sewer system.
		b. Yes, but only if you are on private sewer system.
		c. Yes, but it must be drained into a storage tank and then to drain fields.
		d. Yes.
All fixtures that do not contain waste particles may be used as fixture drains. (IPC 202; UPC 209). Incorrect answer. Please choose another answer.

474.	Gray water that enters a collection tank must be:
		a. Filtered
		b. Stored for 24-48 hours before discharging
		c. Drained into an open drain that terminates at the open air
		d. Measured with a flow meter
Any gray water going into a gray water system is required to be filtered as stated in the plumbing code regulations. (IPC 1302.5; UPC 1506.10.5). Incorrect answer. Please choose another answer.

475.	You are on a project job site where a new gray water system is being installed. You have obtained the following information to size the gray water system. The annual rainfall is 21 inches. There are 2 full bathrooms in the home and the estimated water usage per person is 85 gallons. Four people will live in the house. What is the estimated gray water discharge based on the number of occupants?
		a. 42 gallons
		b. 304 gallons
		c. 340 gallons
		d. 14,280 gallons
The estimation of gray water discharge is based on the gallons of use per day per occupant based on the type of fixtures connected to a system. This is derived by the following equation: C= A x B A = The number of occupants B = The estimated flow demands per occupant C = Estimated gray water discharge based on the total number of occupants In this case, C = 4 x 85 = 340 gallons. (IPC 1402.1; UPC 1503.8). Incorrect answer. Please choose another answer.

476.	You have been asked to disinfect a gray water system at a new residential house to flush the toilets and urinals. Which would you use to disinfect the gray water system to flush the toilets and urinals?
		a. Acetone
		b. Ozone
		c. Benzene
		d. Ammonia
The disinfectants that are approved by the plumbing code for the purpose of flushing toilets and urinals are chlorine and ozone. (IPC 1301.2.1; UPC 1506.10.2). No other disinfectants are approved. Incorrect answer. Please choose another answer.

477.	The construction manager on the job site contacts you saying that the plumbing supplier has delivered a fiberglass storage tank for the gray water system. He informs you that on the last system he installed he was provided with a steel tank. He wants to check with you as to what type of tank is required. How do you answer his question?
		a. Only a steel tank is ever allowed.
		b. There is no regulation on gray water storage tanks.
		c. The local authority may adopt alternative materials under the code.
		d. A plastic tank with a 2' cleanout opening and 3" separate vent can be used.
The plumbing code states that a steel tank shall be used and protected from corrosion; however, holding tanks constructed of alternative materials may be permitted by the authority having jurisdiction, provided they comply with approved applicable standards. A call to the plumbing inspector may be necessary here. (IPC 1301.9.2). Incorrect answer. Please choose another answer.

478.	You receive a phone call from your journeyman plumber, and he is at the plumbing supply house and is purchasing pipe for a residential gray water system. He wants to know what type of piping he should purchase for this application. You should instruct him to purchase________________.
		a. perforated drain pipe
		b. schedule 35 pipe
		c. pipe with purple background and black upper-case lettering, with the words "CAUTION: NON-POTABLE WATER, DO NOT DRINK"
		d. gray PVC pipe that has a marking stating "WASTE WATER, UNSAFE TO DRINK"
All gray water systems must have a purple background with black uppercase lettering, with the words "CAUTION NON-POTABLE WATER, DO NOT DRINK". No other color or markings can be used to identify gray water piping systems. (IPC 608.9.2; UPC 601.3.3). Incorrect answer. Please choose another answer.

479.	What is the minimum horizontal distance that must be placed between a gray water storage tank and a water well?
		a. 5 feet
		b. 10 feet
		c. 50 feet
		d. 100 feet
Nonpotable water storage tanks must be located at least 50 feet away from water wells. (IPC Table 1302.71; UPC Table 1503.4). Incorrect answer. Please choose another answer.

480.	On a project, your excavator and journeyman plumber are considering where to locate and install a gray water holding tank. They have proposed four different locations with differing trench dimensions. As the master plumber, which one must you select as compliant with the code?
		a. 2 feet wide by 105 feet long
		b. 4 feet wide by 90 feet long
		c. 6 feet wide by 100 feet long
		d. 3 feet wide by 110 feet long
A seepage trench cannot be wider than 5 feet and cannot exceed 100 feet long, as stated in the gray water section of the plumbing code. (IPC 1403.1.2; UPC Table 1504.7.3). Incorrect answer. Please choose another answer.

481.	What is the minimum pipe size allowed for seepage trench piping?
		a. 1-1/2" pipe
		b. 2" pipe
		c. 3" pipe
		d. 4" pipe
The minimum diameter pipe size allowed in a seepage trench is 3". (IPC 1403.2; UPC 1504.7.1). Incorrect answer. Please choose another answer.

You are determining the daily discharge of gray water for a residential home in a renovation project. The home has three bedrooms, a master bath with tub/shower, a second bathroom with tub/shower and a powder room. The home has a dishwasher and a clothes washer.

482.	To calculate the daily discharge amount of gray water for residential use, you must know the number of ___________________:
		a. occupants and baths
		b. occupants and toilets and urinals
		c. occupants and flow demands
		d. bedrooms and baths
Estimated gray water discharge is calculated by number of occupants and flow demands for each. (IPC 1402.1; UPC 1503.8). Incorrect answer. Please choose another answer.

483.	No one lives at the house currently. What is the total number of occupants you should use for your formula?
		a. 3
		b. 4
		c. 5
		d. 0
To calculate the number of occupants, the codes look to the number of bedrooms. (IPC 1402.1; UPC 1503.8.1). The first bedroom is attributed with two occupants. Additional bedrooms are given one additional occupant. So, a three-bedroom house will have four occupants for the formula for system sizing. Incorrect answer. Please choose another answer.

484.	What is the total amount of gray water, per day, draining into the receptor?
		a. 120 gallons
		b. 160 gallons
		c. 200 gallons
		d. 240 gallons
To calculate the answer, you must add the gallons per day per occupant attributed to each fixture. A shower, bathtub and lavatory get 25 gallons per day per occupant and a clothes washer gets 15 gallons per day per occupant. 4 occupants x 25 gallons per day for showers, bathtub and lavatory = 100 gallons per day 4 occupants x 15 gallons per day for the clothes washing machine = 60 gallons per day Total: 160 gallons per day (IPC 1402.1; UPC 1503.8.1). Incorrect answer. Please choose another answer.

485.	Assume that a single-family residence has 5 occupants. Only the clothes washer is connected to the gray water system. What is the total amount of gray water, per day, draining into the system?
		a. 15 gallons
		b. 75 gallons
		c. 160 gallons
		d. 200 gallons
To calculate the gray discharge, a clothes washer gets 15 gallons per day per occupant. 5 occupants x 15 gallons per day = 75 gallons per day (IPC 1402.1; UPC 1503.8.1). Incorrect answer. Please choose another answer.

486.	In commercial applications, the gray water discharge estimated flow demand can be based on:
		a. Water use records
		b. Single-family dwelling flow amounts
		c. Multi-family dwelling flow amounts
		d. Number of occupants
Water use records can be used to calculate the estimated flow demand for gray water discharge in commercial applications. (IPC 1402.1; UPC 1503.8.2). Under the IPC, discharge of fixtures not discharging gray water are subtracted from the water use records to get the gray water discharge estimated flow demand. An estimated flow demand can also be calculated based on the type of fixtures discharging to the system. Incorrect answer. Please choose another answer.

487.	Which of the following must be provided to the building owner of a graywater reuse system by the system designer?
		a. Nonpotable water signage
		b. Nonpotable water permits
		c. Operation and Maintenance Manual
		d. Construction performance guarantee
The codes require the system designer to provide the owner of the building an operation and maintenance manual. (IPC 1302.13; UPC 1501.6). Master Plumber Practice Exam - Section 12 Storm Drainage Incorrect answer. Please choose another answer.

Storm Drainage

488.	How does the code define storm water or rainwater?
		a. Gray water
		b. Black water
		c. Natural precipitation
		d. Both a and c
The code defines storm water or rainwater as natural precipitation. (IPC Definitions Storm Water; UPC Definitions Rainwater). This is essentially rainfall or snow melt. Special drainage systems are required to collect and convey storm drainage to an appropriate disposal site. The drainage system used for storm water is rarely allowed to be a sanitary drainage system. Only a few locations utilize combination storm-and-sanitary drainage systems. Incorrect answer. Please choose another answer.

489.	Rainwater catchment systems use _______________ to gather the water.
		a. Nearby pond
		b. Flower beds
		c. Roof surfaces
		d. Fire main discharge
Rainwater catchment systems use roof surfaces or other manmade above ground collection surfaces. (IPC 1305.5; UPC 1603.3). Incorrect answer. Please choose another answer.

490.	The size of a roof drain must be considered in a determination of the flow rates used to design a storm-water drainage system.
		a. True
		b. False
True - You must know the size of all roof drains that will be connected to a storm drainage system. A 2-inch roof drain accepts far less water than a 3-inch drain. Knowing how much water can be placed into a drainage system at any given time is required to size the drainage system. Incorrect answer. Please choose another answer.

491.	Storm water can be drained into a ______.
		a. combination sewer
		b. building sewer
		c. storm sewer
		d. All the above
Storm water is considered to be any surface or rain water that does not receive human waste. Storm water can be drained into a combination sewer only if the sanitary and storm sewers are not separated; this is normally found in older communities. Building sewers that receive water from a combination sewer can also be considered to drain storm water. Storm water cannot be drained into sewers intended for sewage only. Incorrect answer. Please choose another answer.

492.	When can a storm sewer be connected directly into a sanitary sewer?
		a. Never
		b. Only when a combination sewer is used
		c. Only on a private sewer system
		d. On parking lot drains and catch basins that run parallel to the public sewer system
When a combination sewer is used both sanitary and storm water run through the same piping. This is normally found in older cities that have a one pipe system. Incorrect answer. Please choose another answer.

493.	Storage tanks for rainwater in direct sun must be made of which of the following material?
		a. Opaque, UV resistant material
		b. Transparent material to kill algae growth
		c. Fiberglass
		d. Concrete
The codes require that rainwater storage tanks located above ground, and in direct sunlight, be made of an opaque, UV resistant material. (IPC 1301.9.1; UPC 1603.7). This is to prevent algae growth. Storage tanks may be made of fiberglass, concrete or galvanized steel. If the tank will be behind a sun barrier or inside a building, the requirement for an opaque material may not apply. Incorrect answer. Please choose another answer.

494.	When an overflow drain discharges to a storm drainage system, what must be installed on the overflow drain piping?
		a. Shutoff valve
		b. Backwater valve
		c. Water pump
		d. None of the above.
Overflow drains must be protected by backwater valves to protect the drain piping from backflow. (IPC 1303.11.1; UPC 1603.9). Shutoff valves are not permitted. Incorrect answer. Please choose another answer.

495.	A general contractor has asked you to design a storm-water drainage system. During planning talks, you are working with both the land developer and the general contractor to determine the best way to deal with storm drainage. The developer has asked you to provide a list of options for suitable disposal or collection sites for excess ground water on the proposed project. Which of the following should your list include?
		a. A catch basin
		b. A retainage pond
		c. A storm sewer
		d. All of the above
Storm water has to drain to an approved place of disposal. (IPC 1101.2; UPC 1101.2). Storm water is allowed to enter a storm sewer that conveys the water to a suitable disposal site. Catch basins are often used to control storm-water drainage. It is also common for ponds to be created in the green space of a development and these ponds can be used to process the drainage of storm water. The ponds can further be used as a suitable source of water for ground irrigation purposes. The choice of which type of system to use will be contingent on the type of development and the available resources. Incorrect answer. Please choose another answer.

496.	As a plumber who is sizing a storm-drainage system there are certain pieces of information that you must consider. Without accurate data, you cannot design a suitable drainage system for storm water. As a designer, you are developing a plan for the collection of surface water. Which of the following data will you need to make an accurate design?
		a. The occupancy type of the structure for which storm drainage is being provided
		b. Local rainfall rates
		c. The square footage of all areas subject to surface water runoff
		d. Both b and c
You will need to know the total surface area that will be subject to surface water. Additionally, you must refer to local rainfall rates to know what can be expected as a maximum rate of rain that may be received in a one-hour period. These rainfall rates can be found in your local plumbing code book. The rainfall rates are listed by state with breakdowns for major cities. You should use the data that is known for your local area if you are able to obtain it. Otherwise, choose a city listed in the plumbing code that is closest to location for the job that you are designing. Check with your local county offices or your state agencies to see if rainfall rates are available for your specific location before choosing the closest city listed in the plumbing code. Incorrect answer. Please choose another answer.

497.	When designing a storm system, it is designed to flow at_________________ capacity.
		a. one half
		b. on third
		c. full
		d. two times the annual rain fall for a 100-year rain
A storm drain is designed to run at full discharge; this is will allow any debris, leaves and trash to be flushed from the system. Incorrect answer. Please choose another answer.

498.	A gutter that will be installed horizontally to collect and convey storm water is required to have a pitch (grade) that is no less than_______.
		a. 1/16 inch
		b. 1/8 inch
		c. 1/4 inch
		d. 1/2 inch
The minimum allowable grade for a horizontal gutter installed to collect and convey ground water is 1/16 of an inch. (IPC Table 1106.2; UPC 1103.3). You should find tables in your local plumbing code book that detail this usage. You may want to use a steeper grade to minimize the diameter size required for a horizontal gutter. Incorrect answer. Please choose another answer.

499.	When designing storm drainage systems, the size of storm drainage piping is based the maximum rainfall rate for a certain geographical location that occurs once every ____________ years.
		a. 10
		b. 25
		c. 50
		d. 100
The codes are based on the worst-case scenario that can occur once every 100 years. (IPC 1106.1; UPC 1101.12.1). In this way, storm drainage systems are to be designed to withstand the harshest weather conditions. The rate is based on a statistical analysis of weather records and is based on a 60-minute rainfall. It is possible to have two 100-year storms in a one-week period, but its probability is low. Incorrect answer. Please choose another answer.

500.	What is the historically based rainfall rate of Miami, Florida, that is to be used in designing storm drainage systems?
		a. 2"
		b. 3"
		c. 4.5"
		d. 5"
The codes provide maps or tables to determine the rainfall rates of all geographic locations around the United States. (IPC Figure 1106.1(2); UPC Appendix D, Table D 101.1). Incorrect answer. Please choose another answer.

501.	You are designing a gutter system for a commercial building. The building has a roof with the following dimensions: 50' x 20'. The rainfall rate in the location is 2 inches per hour. The slope of the gutter will be 1/8". What is the size gutter you must use?
		a. 3"
		b. 4"
		c. 5"
		d. 6"
You should find tables in your local plumbing code book that detail this usage. With the stated circumstances, a 4" gutter would have to be used. (IPC Table 1106.6; UPC Table 1103.3). 50' x 20' = 1,000' square feet of roof area To obtain a gutter size under the IPC, you will need to determine the gallons per minute (GPM): Gallon Per Minute (GPM) = Rainfall intensity in feet per hour x Roof area x .0104 (constant) GPM = 2 in x 1,000 sf x .0104 GPM = 20.8 (IPC 1106.2.1). Incorrect answer. Please choose another answer.

502.	You are determining the size of the horizontal roof drain to use on a flat roof for a commercial building that has the dimensions of 130' x 90'. The rainfall rate for the location is 1 inch per hour. The slope of the horizontal piping will be 1/4". What is the smallest size horizontal drain that can be used?
		a. 3"
		b. 4"
		c. 5"
		d. 6"
You should find tables in your local plumbing code book that detail this usage. With the stated circumstances, a 5" would have to be used. (IPC Table 1106.6; UPC Table 1103.3). While the codes allow a 5" horizontal roof drain to be used, it is not available in plastics, so practically a 6" drain would be used for roof drain piping. 130' x 90' = 11,700 sf Gallon Per Minute (GPM) = Rainfall intensity in feet per hour x Roof area x .0104 (constant) GPM = 1 in x 11,700 sf x .0104 GPM = 121.68 (IPC 1106.2.1). Incorrect answer. Please choose another answer.

503.	You are designing a storm drainage system for a building that has two levels, each level with a different storey. The right section of the building is 5 storeys and the left section is 3 stories tall. The height of each story is 12 feet. The 5 storey section has a flat roof dimension of 70' x 60' and the 3 storey section has a roof with a dimension of 80' x 60'. The vertical wall of the 5 story section, that rises above the 3 storey section, measures 24' x 60' and drains to the lower roof. What is total square footage to be used in determining size of drain piping?
		a. 4,200 sf
		b. 4,800 sf
		c. 9,000 sf
		d. 9,725 sf
In addition to adding the area of the two roof surfaces, the plumber needs to add a percentage of the vertical wall area that drains onto the lower roof. (IPC 1106.4; UPC 1103.4). Under the IPC, half of the area of every vertical wall draining onto a lower flat roof is included. Under the UPC, if there is only one vertical wall draining to a lower roof, it is one-half the area of the vertical wall. If there is more than one vertical wall, the UPC gives other divisors for the area. 70' x 60' = 4,200 sf 80' x 60' = 4,800 sf 24' x 60' = 1,440 sf 1,440 sf ÷ 2 = 725 sf 4,200 + 4,800 sf + 725 sf = 9,725 sf Incorrect answer. Please choose another answer.

504.	Storm-water drainage systems have the same requirements for cleanouts as sanitary drainage systems.
		a. True
		b. False
True - It is true that the same cleanout rules and regulations that apply to a sanitary drainage system apply to storm-water drainage systems. (IPC 1101.8; UPC 1101.13). Incorrect answer. Please choose another answer.

505.	Roof drains must be _____________.
		a. Clearly marked as storm-water drainage components with a metal identification tag permanently attached to them
		b. Equipped with removable strainers
		c. Constructed to plastic or cast iron
		d. Both a and b
Roof drains are required to be equipped with removable strainers. (IPC 1110.3; UPC 1102.2). These strainers are intended to block debris from entering the drainage system. They must be removable so that they can be cleaned as needed and to allow drain cleaning of the storm drainage piping when required. Incorrect answer. Please choose another answer.

506.	. Assume that you are designing a roof drainage system for a flat roof. The square footage of the roof area is approximately 8,000 square feet. How many roof drains will you need in your design drawing?
		a. 1
		b. 2
		c. 4
		d. 6
A roof that has 10,000 square feet of surface area, or less, is required to have a minimum of two roof drains. (IPC 1110.4). It is often wise to include more than the minimum, but two roof drains will meet code requirements for the roof drainage up to 10,000 square feet in area. Incorrect answer. Please choose another answer.

507.	You are faced with a roof drainage design for a building that will contain 17,000 square feet of roof area. What is the minimum number of roof drains required for this type of structure?
		a. 3
		b. 4
		c. 6
		d. 8
When the surface area of a roof exceeds 10,000 square feet the roof must be equipped with a minimum of four roof drains. (IPC 1110.4). Depending on the shape and design of the roof, it may be beneficial to install more than four roof drains, but the code only requires the installation of four drains. Incorrect answer. Please choose another answer.

508.	There are times when a secondary roof system is provided for a building to accommodate storm drainage. When this is the case, the secondary drainage system is not allowed to discharge into the same system that accepts the waste from the primary system. The discharge from a secondary system must ___________.
		a. Never discharge into a catch basin
		b. Discharge into a storm sewer
		c. Discharge above grade
		d. All of the above
Secondary roof-drainage systems are required to discharge above grade. (IPC 1108.2; UPC 1101.12.2.21.). This is required to prevent overloading storm drainage systems that are already running at capacity. If the primary system is unable to handle the demands the secondary system kicks in. Incorrect answer. Please choose another answer.

509.	Which of the following types of valves are likely to be found in a storm-drainage system?
		a. Stop valves
		b. Flapper valves
		c. Backwater valves
		d. Stop-and-waste valves
Backwater valves are used in storm-drainage systems. (IPC 1101.9; UPC 1101.6.4). Any backwater valve used in such a system must be of an approved type for the intended use. These valves prevent drainage water from backing up into a system beyond the point of the backwater valve. Incorrect answer. Please choose another answer.

510.	Assume that you are installing a storm-water drainage system for a commercial facility. The building has a flat roof that will require four rain leaders. One of these exterior, vertical rain leaders will be installed close to the building with brackets. The chosen location puts the vertical rain leader near a loading dock where tractor-trailers unload their goods. Does this affect your plumbing design?
		a. No, the pipe is on the outside of the building and does not fall under any special provisions.
		b. No, the pipe is for rainwater only.
		c. Yes, the pipe should be labeled as "Storm Water Only".
		d. Yes, the pipe may require protection from being crushed.
The piping in a storm drainage system must be protected just as piping in a sanitary drainage system. In the scenario here, the rain leader is exposed and is close to a loading dock. It is reasonable to assume that a truck might back into the pipe and crush it. With this being the case, the plumbing code requires the pipe to be protected. This would likely be done with a physical barrier that would prevent unwanted contact with the piping. Incorrect answer. Please choose another answer.

511.	Roofs of buildings that are used for purposes in addition to shelter fall under different regulations for roof drains. When installing roof drains on these roofs the roof drains _________.
		a. Must not be equipped with roof drains
		b. May be installed so that the strainers are flush with the roof surface
		c. Must be surrounded by a visible barrier to prevent tripping accidents
		d. May not be larger than two-inches in diameter
When roofs of buildings are approved for use that is in addition to shelter, such as a rooftop patio, the roof drains installed on the roofs may be installed so that their strainers are flush with the roof surface. (UPC 1102.2). Normally roof drains are required to extend a minimum of four inches above a roof surface. When the roof is being used for purposes in addition to shelter there is a risk of injury if someone walks into a protrusion. Therefore, the strainers on roof drains are allowed to be installed at an even grade with the roof surface. All roof penetrations must be watertight. Incorrect answer. Please choose another answer.

512.	A few locations allow storm-drainage piping to be conveyed into a combination sewer. This is a sewer that will carry both storm water and sanitary drainage. Assume that you are designing a piping diagram for such a system. Your drawing must detail the connection of rain leaders and storm drains to the combination sewer. Which of the following components need to be trapped in your drawing?
		a. Rain leaders
		b. Storm drains
		c. Both a and b
		d. None of the above. Combination sewers are never permitted.
On the rare occasions, when storm-water piping can be connected to a sanitary drainage system, the piping must be trapped. (IPC 1103.1; UPC 1101.15). The trap is required to be accessible. All traps used in these circumstances are required to be equal in size to the drain that it is serving. Most plumbers will not be affected by these rules since it is normally a code violation to discharge storm water into a sanitary drainage system. Incorrect answer. Please choose another answer.

513.	The sizing of piping for rain leaders is done in a way that is similar to the method used for sizing of piping for downspouts.
		a. True
		b. False
True - The sizing of rain leaders is very similar to the sizing for downspouts. Both pipes have a vertical discharge, so the delivery rates of a volume of water are essentially the same. The sizing methods are, however, different related to the techniques to size a horizontal gutter or drain. (IPC Tables 1106.2 and 1106.3; UPC Tables 1103.1 and 1103.3). Incorrect answer. Please choose another answer.

514.	Storm water piping may not be used for ____________.
		a. Conveying sanitary drainage
		b. Conveying water that may later be used for irrigation purposes
		c. Both a and b
		d. None of the above
Storm water piping is not allowed to be used to transport sanitary drainage. (IPC 1101.3; UPC 1101.3). Do not let this confuse you. Yes, there are combination sewers that do convey both storm water and sanitary drainage. The difference is that the combination sewer is a sanitary drainage system that is also conveying storm water. This is different from a storm drain that is used to convey sanitary drainage. Incorrect answer. Please choose another answer.

515.	Which of the following is a tank or pit that receives sewage or liquid waste located below the normal grade of a gravity system that must be emptied by mechanical means?
		a. Meter box
		b. Septic Tank
		c. Cistern collection tank
		d. Sump
A sump is a tank or a pit that receives sewerage or liquid waste below the normal grade of a gravity system and that must be emptied by mechanical means. Incorrect answer. Please choose another answer.

516.	You are drawing a plumbing diagram to show the installation of a sump pump that will remove excess groundwater from a residential basement. This pump will be pumping storm water. Your drawing is required to show the sump pump being installed in a ________________.
		a. sump
		b. sump and vented
		c. sump with a gas-tight cover
		d. sump with a gas-tight cover and vent
Sump pumps are required to be installed in sumps. (IPC 1113.1.2; UPC 1101.6.2). In other words, it is not acceptable to stick a sump pump in a hole in the ground. You must provide a suitable sump to house the pump. Normally subsurface drainage piping will enter the sump to deliver excessive ground water. A lid must cover the sump, but it is not required to be gas-tight or vented. However, the lid must be removable. Incorrect answer. Please choose another answer.

517.	Which of the following materials are approved for use in the creation of a sump that will hold a sump pump?
		a. Plastic
		b. Steel
		c. Concrete
		d. Any of the above
Sumps used to hold sump pumps may be constructed of plastic, steel, concrete, tile or cast iron. (IPC 1113.2.1). The sump must be watertight. Most sumps in modern plumbing systems are made of plastic. Due to the risk of rusting, steel is the least desirable material to be used in the creation of a sump. Still, it is an acceptable material under the plumbing code. Incorrect answer. Please choose another answer.

518.	Which of the following types of copper piping are permitted for use as drainage piping installed in conjunction with a sump pump?
		a. Type K copper
		b. Type L copper
		c. DWV copper
		d. All of the above
Drainage piping for a sump pump can be made of type K copper, type L copper, type M copper or DWV copper. (IPC 1102.4; UPC 1101.4.2). Plastic piping is also a suitable drainage piping for the discharge of water from a sump pump. Incorrect answer. Please choose another answer.

519.	Assume that you are drawing a piping diagram for the installation of a sump pump in a single family dwelling. Which of the following are you going to show installed in the discharge piping?
		a. Check valve
		b. Stop valve
		c. Backwater valve
		d. Butterfly valve
Sump pumps should be equipped with check valves in their discharge piping. (IPC 1113.1.4). This prevents water that has been pumped up from running down the drainage piping and refilling the sump. If this happens, the pump will have to pump the water again. This puts undue use on the pump. The check valve prevents water from running back into the sump. When a check valve is in place it can extend the life of a sump pump considerably. Incorrect answer. Please choose another answer.

520.	Which of the following locations is not allowed to receive the discharge from a sump pump?
		a. Catch basin
		b. Subsurface drainage piping
		c. Sanitary drainage system
		d. Storm sewer
The discharge from a sump pump should not be piped into a sanitary drainage system. (IPC 1101.3; UPC 1101.3). It is quite common to find the discharge piping from a sump pump connected to a building drain, but it is not supposed to be piped in that manner. The water from a sump pump should be treated as storm water and piped accordingly. Incorrect answer. Please choose another answer.

521.	Assume that you are planning the installation of a sump pump in a residential basement. The pump will be installed in a sump that will collect the drainage from interior subsurface drain piping. You have sized the pump based on the lift requirements and the volume capacity of the sump. Then you drew in a check valve on the discharge piping from the pump. No vent is required but all sump pump installations require a full-open gate valve on the discharge piping.
		a. True
		b. False
False - The discharge piping between a sump pump and its termination point does not require a gate valve. However, a check valve should be installed in close proximity to the sump pump to extend the pump's working life. Incorrect answer. Please choose another answer.

522.	Subsoil drainage piping for storm-water drainage is allowed to be conveyed through _________.
		a. PVC
		b. Vitrified clay pipe
		c. Both a and b
		d. None of the above
Subsoil drainage piping for storm-water drainage can be made of many types of material. Accepted types of material for this purpose include the following: • Cast-iron pipe • Polyethylene (PE) plastic pipe • Polyvinyl chloride (PVC) pipe • Stainless steel pipe • Vitrified clay pipe (IPC Table 1102.5; UPC 1104.1.6). Incorrect answer. Please choose another answer.

523.	When a roof is designed as any type of roof that is not a hanging roof, the roof must be equipped with ____________.
		a. Rain diverters
		b. Gutters
		c. Roof drains
		d. Any of the above
Hanging roofs do not require roof drains. All other types of roofs are required to be equipped with suitable roof drains and an approved storm-water drainage system. Roofs that are pitched to shed water into hanging gutters are exempt from the need for roof drains. Most jurisdictions do not require gutters on residential roofs that are hanging. It is generally acceptable for those roofs to shed water directly to the ground. Incorrect answer. Please choose another answer.

524.	Of the following, what is the type and smallest size of pipe that can be used in subsoil drains?
		a. 6" perforated pipe or split pipe
		b. 4" solid pipe
		c. 4" perforated pipe or split pipe
		d. 6" solid pipe
Subsoil drains must be open-jointed horizontally split or perforated pipe. (IPC 1102.5; UPC 1101.4.6). They cannot be less than 4" inches in diameter (IPC) and 3" (UPC). (IPC 1111.1; UPC 1101.6). Subsoil piping receives the water around the foundation of a building. This also helps relieve negative pressure under surface slabs. Incorrect answer. Please choose another answer.

525.	Does the slope of storm drainage (horizontal gutter) affect the size of the gutter to be used?
		a. No, it has no effect on sizing of the system.
		b. Only the annual rain fall is the determining factor for size requirements.
		c. If the slope of the storm drainage piping is increased, it will allow more surface water to be discharged.
		d. Storm drainage that collects water from a roof must have a minimum of ¼ inch per foot fall in slope, if the pipe is 3 inches or larger.
If you increase the slope of the storm drainage piping it will allow more surface water to be discharged, which can increase the square footage amount of roof being drained. For example, if you install a storm system with a grade of a 1/16 or 1/8 inch of pitch per foot fall, the collection pipe will receive less water which will result in less area of rain water runoff. If 1/4 inch per foot fall is used, you can approximately double the square foot to receive storm water runoff. Incorrect answer. Please choose another answer.

526.	The plumbing code has no requirements for cleanouts, sizing or per foot fall for underground installation of storm drainage systems. How then are storm drainage systems installed?
		a. The same requirements are required for storm drainage systems as that of sanitary systems
		b. The local sewer officials will govern the installations requirements
		c. The engineer sizing the system will determine the installations and material procedures
		d. Commercial installations require that the municipal sewer supplier provide the requirements for installation
The plumbing code regulations require the same restrictions for sizing, material, and installations as sanitary sewer requirements. The code official will perform the same inspections as sanitary sewer systems in regards to material and installation procedures, as foot per fall. Incorrect answer. Please choose another answer.

527.	You are designing a storm drain system for a large commercial warehouse. The roof will have vertical walls extending above it along its perimeter. It is to use interior roof drain piping that is connected to the storm drain sewer. Which of the following is required to be included as part of this system?
		a. Secondary roof drains
		b. Backflow prevention
		c. Storm drain traps
		d. Siphonic roof drains
Where roofing has vertical walls along its perimeter, creating a situation where water could be entrapped if a primary drain becomes clogged, a secondary drain system must be installed as a means for the entrapped water to drain. (IPC 1108.1; UPC 1101.12.2.1). Such secondary systems are referred to as emergency overflow drains. Incorrect answer. Please choose another answer.

528.	When sizing secondary roof drain piping for storm drainage systems, the size will be:
		a. Double the size of the primary roof drain.
		b. One-half the size of the primary roof drain.
		c. The same size as the primary roof drain.
		d. The same size as the sanitary drainage system.
The secondary roof drain piping will be sized the same as the primary drain. (IPC 1108.3; UPC 1101.12.2.2.1). This makes sense since the secondary drainage system must handle the same water load as the primary drain if it clogs. Incorrect answer. Please choose another answer.

529.	Which of the following is the proper end point for a secondary drain in a storm drainage system?
		a. Building storm sewer
		b. Primary storm drain
		c. Sanitary drainage system
		d. Above grade outside building
A secondary drain for a storm drainage system must have a separate end point than the primary system and empty above grade, in a place that can be noticed by the building occupants or maintenance personnel. (IPC 1108.2; UPC 1101.12.2.2.1). Incorrect answer. Please choose another answer.

530.	Assume that you are designing a system of piping to collect rainwater on a flat roof. As part of the process, you will determine the size and grade of both vertical and horizontal rain leaders and gutters. The overall design will include the number of roof drains needed and their placement. As you draw the riser diagram for the piping, you must indicate the locations and heights of the roof drains. What is the minimum height that a roof drain/scupper is required to extend above a roof surface?
		a. 2 inches
		b. 3 inches
		c. 4 inches
		d. 6 inches
Roof drains are to be installed with a protrusion of at least four inches above the surface of a roof being drained. (IPC 1106.5; UPC 1101.12.2.1). This is to keep the drains from becoming clogged with leaves and other debris that may be collected on the roof surface. All roof drains should be properly protected to avoid blockage of the drain during maximum rainfalls. Incorrect answer. Please choose another answer.

Fuel Gas

531.	The maximum arc for a metallic-pipe bend is __________.
		a. 16 degrees
		b. 22.5 degrees
		c. 45 degrees
		d. 90 degrees
The maximum arc allowed for a metallic-pipe bend is 90 degrees. (IFGC 405.2; UPC 1210.6.1). The bend must be made with bending tools and procedures that are meant for the purpose. The bends must be smooth and free from buckling, cracks and other mechanical damage. It is important to keep longitudinal welds of pipe near the neutral axis of the bend. Incorrect answer. Please choose another answer.

532.	Can any of these plastics be used for fuel gas piping?
		a. PVC
		b. CPVC
		c. High density Polyethylene
		d. Flexible clear tubing
Yellow high-density polyethylene, HDPE, is used for fuel gas piping. (IFGC 403.5; UPC 1208.5.4). It generally is installed in one long piece. It can be fusion welded or coupled with approved connectors. Incorrect answer. Please choose another answer.

533.	How should approved polyethylene plastic fuel gas piping be marked?
		a. Fuel Gas - Polyethylene
		b. Danger - Gas
		c. Gas ASTM D2945
		d. Gas ASTM D2513
When polyethylene plastic piping is used for fuel gas piping, the piping must be marked "Gas" and "ASTM D2513". (IFGC 403.5; UPC 1208.5.4). Polyamide pipe is required to be marked "Gas ASTM D2945". Incorrect answer. Please choose another answer.

534.	Plastic (PE) gas piping is allowed to be installed ____________.
		a. In attics
		b. Underground
		c. Only in basements and crawlspaces
		d. Only in residential dwellings
The only location that plastic gas piping can be installed is outside underground. (IFGC 404.17.1; UPC 1210.1). It must not be installed under slabs or in any building. There is too much risk that the pipe might be punctured. When the pipe is buried outside it is unlikely to be punctured or ruptured. If it is, the leaking gas will disperse into open air. It is generally one long piece of tubing adapting to steel as it leaves the ground. Incorrect answer. Please choose another answer.

535.	What type of gas piping fittings and connections may be concealed?
		a. Threaded couplings
		b. Brazed fittings
		c. Compression fittings
		d. All of the above.
When fittings and connections installed on gas piping is to be concealed, they must be of an approved type. The codes permit threaded couplings, brazed fittings, welded fittings and listed compression fittings. (IFGC 404.5; UPC 1210.4.1). Incorrect answer. Please choose another answer.

536.	Underground plastic gas piping requires ____________.
		a. The installation of a tracer wire
		b. Mechanical-joint connections
		c. The installation of a pulse sensor
		d. The installation of a drip leg
Plastic gas piping requires an 18-gauge wire conductor be installed next to the pipe. (IFCG 404.17.3; UPC 1210.1.72). This allows the path of the piping to be tracked from above ground with metal-detecting devices. The tracer wire is to be turned up and exposed above grade at each end of the piping trench. It is terminated above ground so a locating devise can clip onto it and is electrifying so it can be marked on the ground. This minimizes the potential for damage. Incorrect answer. Please choose another answer.

537.	Piping that conveys wet gas must be ________________________.
		a. Provided with drip legs in low spots
		b. On a level basis
		c. Trapped
		d. Identified with yellow bands of paint every 15 linear feet
Piping that conveys wet gas must have drip legs installed at all low points where condensation might collect. (IFGC 408.2; UPC 1210.7). Drip legs are normally six to eight inches. They must be readily accessible. Incorrect answer. Please choose another answer.

538.	Nonmetallic flexible gas connectors for all gas appliances, except ranges and clothes dryers, are limited to a maximum length of _______ inches.
		a. 24
		b. 30
		c. 36
		d. 72
When nonmetallic flexible gas connectors are used for cooking ranges and clothes dryers they can be up to 72 inches in length. (IFGC 411.1.3.1; UPC 1212.3.1). These devices allow a fixture to be moved for disconnection. All flex connections should be as short as is practical. This is due to them being more vulnerable to damage than hard piping. Incorrect answer. Please choose another answer.

539.	What is the smallest pipe size that can be used with Schedule 40 metallic piping in fuel gas systems?
		a. 1/4"
		b. 1/2"
		c. 3/4"
		d. 1"
The minimum size for Schedule 40 metallic piping in fuel gas systems is 1/2". (IFGC Table 402.1(4); UPC Table 1215.2(1)). Incorrect answer. Please choose another answer.

540.	When flow controls are installed on gas piping, they _____________.
		a. must be painted in a conspicuous manner
		b. must not contain sediment traps
		c. must be equipped with a leak-limiting device
		d. are used to keep operating pressure lower than the supply pressure
Flow controls on gas systems are installed to keep the operating pressure of the system lower than the supply pressure for the system. (IFGC 410.1; UPC 1208.3.3). These devices prevent excessive pressure from the distribution system. They must be approved and suitable both the inlet and outlet gas pressure for the application. The flow controls must be readily accessible. Incorrect answer. Please choose another answer.

541.	You are installing a cooking range that uses fuel gas and must install a shutoff valve. Which of the following designs comply with the code for installation of shutoff valves with an appliance?
		a. Locating the shutoff valve 10 feet from the range.
		b. Installing the shutoff valve downstream of a connector.
		c. Placing the shutoff valve behind a removable panel.
		d. All of the above comply with the code.
Only the answer on accessibility complies with the code. Shutoffs must be accessible and it is acceptable to place it behind a removable panel. A shutoff valve must be within 6 feet of the appliance and be located upstream of a connector or union. (IFGC 409.5.1; UPC 1212.6). Incorrect answer. Please choose another answer.

542.	What is the smallest pipe size that can be used with Schedule 40 metallic piping in fuel gas systems?
		a. 1/4"
		b. 1/2"
		c. 3/4"
		d. 1"
The minimum size for Schedule 40 metallic piping in fuel gas systems is 1/2". (IFGC Table 402.4(1); UPC Table 1215.2(1)). Incorrect answer. Please choose another answer.

543.	When installing pressure reducing or step-down controls on gas valves, they must be:
		a. Concealed
		b. Installed with a vent
		c. Accessible
		d. AGI approved
All flow controls must be assessable for servicing. (IFGC 410.1; UPC 1208.7.2). Incorrect answer. Please choose another answer.

544.	You are testing a gas line in a residential setting that will have a working pressure of 8 psig. Which of the following pressures should you use to test the system?
		a. 4.5 psig
		b. 5 psig
		c. 8 psig
		d. 12 psig
The IFGC requires at least a testing pressure of 1.5 times the working pressure of the appliance. (IFGC 406.4.1). The UPC requires at least 10 psig. (UPC 1213.3). Incorrect answer. Please choose another answer.

545.	You have a gas line that has 4 psig of gas pressure, but your appliance requires a 2-inch water column pressure. How should the installation be made?
		a. Install a full flow shutoff valve and a pressure gauge
		b. Install a needle valve
		c. Install a regulator that converts psig to water column pressure
		d. Install a restricting pilot light fitting
To convert psig to water column pressure, you must install a pressure regulator on the gas line before connecting to the appliance. Incorrect answer. Please choose another answer.

546.	You want to install a flexible gas connection to an appliance. The control valve, to which the connection will be made, is located on the bottom one third of the appliance. Can this be done in accordance with the code?
		a. No, since there is a location restriction.
		b. Yes, since there is no location restriction.
		c. No, since this is not addressed in the plumbing code.
		d. None of the above
There is no location restriction. To make this connection, you must have a shutoff valve and an approved flex line. These flex gas connectors allow an appliance to be moved for connection to the gas line. Incorrect answer. Please choose another answer.

547.	You are replacing a conventional water heater with a tankless water heater. What must be considered on installation?
		a. The gas line size may need to be increased and the existing flue capped off as it is no longer needed.
		b. The heater needs to be installed on an outside wall a maximum of 15 feet from incoming water service.
		c. The heater must be installed with a circulating line.
		d. All of the above.
When installing a tankless water heater, you must consider the gas requirements. In some cases, the gas line, meter and incoming gas service may need to be increased. You must also consider the flue requirements to make sure it is not too long in distance or have too many turns. The flue pipe on a tankless water heater is made from PVC pipe; it is 90% efficient. The existing flue pipe that the standard water heater was connected to will need to be capped as it is no longer needed. In case of spillage or leakage, to prevent excessive damage, a floor drain must be within 10 feet of the heater. Incorrect answer. Please choose another answer.

548.	Can plastic gas pipe be installed above ground?
		a. Yes, as long as schedule 80 or above pipe is used.
		b. Yes, if it has a one eighth inch wall thickness with a metal core
		c. Yes, but only in an attic installation
		d. No
Plastic gas line can only be installed underground. (IFGC 404.17.1; UPC 1210.1). It is not permitted to be used above ground. If it was installed above ground there is a chance that it can be damaged by cutting or rupturing. For underground piping, the acceptable standard is to use screw black iron pipe and fitting. Some municipalities will allow Type "L" copper that is joined by silver solider. Incorrect answer. Please choose another answer.

549.	Can flared fittings be used on natural gas piping installations?
		a. Yes, in conjunction with copper gas pipe.
		b. No, only on propane gas piping.
		c. No, only black iron pipe and fittings can be used.
		d. No, dielectric unions must be installed at the appliance.
Flared fitting are allowed in conjunction with copper gas pipe. (IFGC 409.3.4: UPC 1208.5.9.4). These are also found on flex gas connections that connect stoves and dryers to the hard black iron gas piping. Incorrect answer. Please choose another answer.

550.	Why is a drip leg required on a wet gas system?
		a. To act as a reservoir for additional gas as required.
		b. To allow change of direction of gas supply to the appliance.
		c. To collect moisture and particles that may get into the gas system.
		d. To provide a connection point for additional appliances.
A drip leg is required on a wet gas system, because the gas piping has moisture. The drip leg serves as a collection point for the moisture and particles. This is necessary to prevent moisture and particles from entering the gas valve and affecting the gas flow. Incorrect answer. Please choose another answer.

551.	You have completed a minor repair on a cooking range fuel gas line that has already been in service. Which of the following is the next step?
		a. Pressure test the system
		b. Leak test the system
		c. Both a and b
		d. Neither a nor b
No pressure test is necessary on minor repairs, but a leak test must be performed with a non-corrosive leak-detecting fluid or other leak detecting method. (IFGC 406.1.2; UPC 1213.1.2). Incorrect answer. Please choose another answer.

552.	Natural gas systems must be able to be tested, inspected and approved by the plumbing authority. A natural gas line in a single-family home is being tested. Which of the following time periods meet the duration requirement for the tests under the code?
		a. 5 minutes
		b. 9 minutes
		c. 15 minutes
		d. There is no duration requirement.
A 15-minute test would meet the code requirements for testing gas lines. (IFGS 406.4.2 - not less than 10 minutes; UPC 1213.3 - not less than 15 minutes). Incorrect answer. Please choose another answer.

553.	Which of the following mediums is not allowed for use in testing gas pipe installations?
		a. Air
		b. Oxygen
		c. Nitrogen
		d. Carbon dioxide
Oxygen is not allowed to be used when testing a gas piping system. (IFCG 404.6.2; UPC 1213.16). Incorrect answer. Please choose another answer.

Math

554.	How many inches are in 8 feet?
		a. 48"
		b. 54"
		c. 84"
		d. 96"
Number of inches = 12 x number of feet NI = 12 x 8 NI = 96" Incorrect answer. Please choose another answer.

555.	Convert .738 to inches.
		a. 1/3
		b. 1/4
		c. 2/3
		d. 3/4
.738 x 12 1 12 8.85 (round up) 12 9 12 3 4 Incorrect answer. Please choose another answer.

556.	Convert 4.375 to a fraction in sixteenths.
		a. 4 ¼
		b. 4 ½
		c. 4 3/8
		d. 4 3/4
To convert 4.375 to a fraction in sixteenths, we'll focus on the .375 to convert it to sixteenths. .375 x 16 1 16 6 16 3 8 Incorrect answer. Please choose another answer.

557.	Convert .73' to inches.
		a. 7.2"
		b. 8.4"
		c. 8.46"
		d. 8.64"
.72' x 12 inches = 8.64" Incorrect answer. Please choose another answer.

558.	How many feet are in 102"?
		a. 8'
		b. 8' 6"
		c. 9'
		d. 9' 6 "
102" ÷ 12 inches per foot = 8.5 feet 8' x 12 inches = 96 inches 102" - 96" = 6 inches 8' 6 inches Incorrect answer. Please choose another answer.

559.	Convert 2.77' to inches.
		a. 20"
		b. 24 1/2"
		c. 24 3/4"
		d. 25 3/4"
Two feet is 24 inches. So, we have at least 24 inches. To convert .77 to inches: .77 x 12 1 2 9.24 (round down) 12 9 12 3 4 24 3/4 “ Incorrect answer. Please choose another answer.

560.	How many centimeters are in 2.85 meters?
		a. 28.5 centimeters
		b. 285 centimeters
		c. 2850 centimeters
		d. 2,850 centimeters
2.85 meters x 100 = 285 centimeters Incorrect answer. Please choose another answer.

561.	How many meters are in 389 centimeters?
		a. 3.89 meters
		b. 38.9 meters
		c. 3,890 meters
		d. 38,900 meters
389 centimeters ÷ 100 = 3.89 meters Incorrect answer. Please choose another answer.

562.	Add the following fractions: 3/4, 1/8, 3/16, 1/2
		a. 1 1/16
		b. 1 3/4
		c. 1 9/16
		d. 1 11/16
To add or subtract fractions, you need a common denominator, which is 16 in our problem. 4/4 x 3/4 = 12/16 2/2 x 1/8 = 2/16 8/8 x 1/2 = 8/16 12/16 + 2/16 + 3/16 + 8/16 = 25/16 25/16 = 1 9/16 1/4 + 1/4 = 2/4 2/4 can be reduced to 1/2. Incorrect answer. Please choose another answer.

563.	Multiply the following fractions: 3/4, 8/9, 1/2
		a. 1/4
		b. 1/3
		c. 3/8
		d. 3/4
To find the answer, multiply across the tops and across the bottoms of the fractions: 3/4 x 8/9 x 1/2 = 24/72 Reduce: 24/72 = 12/36 = 1/3 Incorrect answer. Please choose another answer.

564.	Solve the following: 1/2 ÷ 3/4
		a. 1/4
		b. 3/8
		c. 2/3
		d. 1/3
1/2 ÷ 3/4 = 1/2 x 4/3 = 4/6 = 2/3 Incorrect answer. Please choose another answer.

565.	A right triangle contains one angle of 44 degrees. Calculate the size of the other small angle.
		a. 90 degrees
		b. 50 degrees
		c. 46 degrees
		d. 45 degrees
A right triangle has 180 degrees in total. The two angles opposite the 90-degree angle must equal 90 degrees. If one of the small angles equals 44 degrees, we subtract 44 degrees from 90 degrees and find our answer: 90 degrees - 44 degrees = 46 degrees. Incorrect answer. Please choose another answer.

566.	How many liters are in a gallon?
		a. 1 liter
		b. 2.5 liters
		c. 2.78 liters
		d. 3.78 liters
A gallon contains 3.78 liters. Incorrect answer. Please choose another answer.

567.	Find the radius of a circle with a diameter of 2.06 meters. Answer in millimeters.
		a. 1.03 millimeters
		b. 103 millimeters
		c. 1,030 millimeters
		d. 10,030 millimeters
The radius of a circle is half of its diameter. R = 2.06 meters ÷ 2 = 1.03 meters To convert meters to millimeters, we multiply by 1,000. 1.03 x 1,000 = 1,030 millimeters R = 1,030 millimeters Incorrect answer. Please choose another answer.

568.	What is the circumference of a circle having a diameter of 14 feet?
		a. 28 feet
		b. 36.7 feet
		c. 42.6 feet
		d. 43.96 feet
Circumference = Diameter x π C = 14 x 3.14 C = 43.96 feet Incorrect answer. Please choose another answer.

569.	What is the area of a circle having a diameter of 6.5 feet?
		a. 33.16 sf
		b. 30 sf
		c. 20.41 sf
		d. 13 sf
Area = π x r² First, find the radius using the diameter of 6.5 feet: 6.5 ÷ 2 = 3.25 Then square the radius: 3.25 x 3.25 = 10.56 r² = 10.56 Then multiple the radius by π (3.14) to find the area: 3.14 x 10.56 = 33.16 sf Incorrect answer. Please choose another answer.

570.	How many circles with a diameter of 2” are needed to equal the area of a circle with a diameter of 8”?
Area of a circle = π x r² First, find the radius of the 2” circle as follows: 2 ÷ 2 = 1 Then square the radius: 1 x 1 = 1 r² = 1 Then multiply the radius by π (3.14) to find the area: 3.14 x 1 = 3.14 Next, find the area of the circle with a diameter of 8”, which has a radius of 4”. r² = 16 16 x 3.14 = 50.24 Finally, divide 50.24 by 3.14 (the area of the 2” circle) to determine how many 2” circles will equal the area of the 8” circle. 50.24 ÷ 3.14 = 16 Incorrect answer. Please choose another answer.

571.	What is the area of a right triangle with a base of 4 feet and a height of 5 feet?
		a. 20 sf
		b. 15 sf
		c. 10 sf
		d. 9 sf
Area of a triangle = Base x Height 2 A = 4 x 5 = 20 = 10 sf 2 2 Incorrect answer. Please choose another answer.

572.	What is the pressure at the base of a column of water that is 1" high?
		a. .036
		b. .343
		c. .434
		d. 5.2
The pressure at the base of a one-foot stack is .434. To find the pressure of a one-inch column, we divide .434 by 12 inches to get our answer. .434 psi ÷ 12" = .036 psi per inch Incorrect answer. Please choose another answer.

573.	What is the interest on $48,500 for 1 year at 7 ½ percent interest?
		a. $290.75
		b. $363.75
		c. $2,907.50
		d. $3,637.50
First, convert the 7 ½ percent of interest into a decimal - .075. Then, multiply $48,500 by .075: $48,500 x .075 = $3,637.50 Incorrect answer. Please choose another answer.

574.	You estimate a re-pipe job including labor and material at $3,200.00. You want to add 12% for overhead/profit. What is the cost for this job?
		a. $3,212.00
		b. $3,238.00
		c. $3,503.00
		d. $3,584.00
$3,200 x .12 = $384 $3,200 + 384 = $3,584 Incorrect answer. Please choose another answer.

575.	You are bidding a job that requires a 6% insurance bond based on the total cost of the project. You have calculated the cost of the job in materials and labor to be $123,500.00. How much will your bid be increased due to the bond?
		a. $741.00
		b. $7,400.00
		c. $7,410.00
		d. $74,100.00
$123,500.00 x .06 = $7,410.00 Incorrect answer. Please choose another answer.

576.	What is the total pressure in pounds on a 6-inch diameter test plug with a water head of 22 feet rounded to the nearest hundredth?
		a. 9.45 psi
		b. 9.55 psi
		c. 9.60 psi
		d. 9.78 psi
Pressure = H x .434 P = 22 x .434 P = 9.548 psi Incorrect answer. Please choose another answer.

577.	What would be the area of a 6-inch diameter test plug with a water head of 22 feet?
		a. 9.42 sq. inches
		b. 27.98 sq. inches
		c. 28.26 sq. inches
		d. 28.38 sq. inches
Area = π x r² a = 3.14 x 3 x 3 a = 3.14 x 9 a = 28.26 sq. inches Incorrect answer. Please choose another answer.

578.	What is the required height of a stand pipe on an overhead tank to provide 50 psi at the ground floor?
		a. 113.26 feet
		b. 114.56 feet
		c. 115.20 feet
		d. 116.32 feet
psi ÷ .434 (Amount of pressure exerted on the base of a one-foot stack) 50 psi ÷ .434 = 115.20 feet Incorrect answer. Please choose another answer.

579.	One man caulked twenty 8" joints in eight hours. How many man hours does this represent per joint?
		a. 20 minutes
		b. 22 minutes
		c. 24 minutes
		d. 26 minutes
Man hours ÷ Number of Tasks = Man hours per Task 8 hours x 60 minutes per hour = 480 minutes 480 minutes ÷ 20 joints = 24 minutes per Task Incorrect answer. Please choose another answer.

580.	Two men caulked eighty 6" joints in sixteen hours. How much time did it take per joint?
		a. 10 minutes
		b. 12 minutes
		c. 14 minutes
		d. 15 minutes
Man hours ÷ Number of Tasks = Man hours per Task 16 hours x 60 minutes per hour = 960 minutes 960 minutes ÷ 80 joints = 12 minutes Incorrect answer. Please choose another answer.

581.	If a job required the purchase of 240 pounds of lead and there was 20% waste, how much lead was used on the project?
		a. 192 pounds
		b. 200 pounds
		c. 220 pounds
		d. 240 Pounds
240 pounds x .2 waste = 48 pounds waste 240 pounds - 48 pounds waste = 192 pounds used Incorrect answer. Please choose another answer.

582.	What is the area of a rectangular lot measuring 112 ft. by 90 ft.?
		a. 9,800 sq. feet
		b. 9,899 sq. feet
		c. 9,960 sq. feet
		d. 10,080 sq. feet
112 feet x 90 feet = 10,080 sq. feet Incorrect answer. Please choose another answer.

583.	Find the area of a plug with the diameter of 12 inches.
		a. 112.13 square inches
		b. 113.04 square inches
		c. 113.25 square inches
		d. 114.05 square inches
Area = π x Radius² 3.14 x 6 x 6 = 113.04 square inches Incorrect answer. Please choose another answer.

584.	What is the pressure in pounds per square inch at the base of a 4-inch soil stack that is 70 feet height?
		a. 30.05 psi
		b. 30.26 psi
		c. 30.38 psi
		d. 30.56 psi
psi = Height x .434 (amount of pressure on the base of a one-foot stack) psi = 70 ft. x .434 = 30.38 psi Incorrect answer. Please choose another answer.

585.	What is the volume of a cylinder 12 inches in diameter and 12 inches high?
		a. 1,325.48 cubic inches
		b. 1,336.54 cubic inches
		c. 1,345.68 cubic inches
		d. 1,356.48 cubic inches
Volume = π x Radius² x Height v = 3.14 x 6 x 6 x 12 v = 3.14 x 36 x 12 v = 1,356.48 cubic inches Incorrect answer. Please choose another answer.

586.	How many gallons will a tank hold if the tank contains 6,570 cubic inches?
		a. 27.98 gallons
		b. 28.44 gallons
		c. 28.75 gallons
		d. 29.12 gallons
Gallons = cubic inches ÷ 231 cubic inches per gallon Gallons = 6,570 ÷ 231 Gallons = 28.44 Incorrect answer. Please choose another answer.

587.	How much drop is there in 18 feet of run at 1/8 inches per foot of grade?
		a. 1-1/8"
		b. 1-3/4"
		c. 2"
		d. 2-1/4"
Drop = Grade x Run Drop= 1/8 inches per foot x 18 feet Drop = 2-1/4" Incorrect answer. Please choose another answer.

588.	What is the area at the top a circular tank with a diameter of 59 inches to make a water tight cap for the tank?
		a. 2,725.65 inches
		b. 2,732.58 inches
		c. 2,742.64 inches
		d. 2,744.26 inches
a = π x radius² a = 3.14 x 29.5 x 29.5 a = 2,732.58 inches Incorrect answer. Please choose another answer.

589.	You are asked to fill a tank with water, but you need to carry the water to the site. How many gallons of water will you need to carry to the site if the tank is 40 inches in diameter and 80 inches in height?
		a. 425.60 gallons
		b. 434.97 gallons
		c. 438.20 gallons
		d. 440.25 gallons
Volume = π x Radius² x Height V = 3.14 x 20 x 20 x 80 V = 100,480 cubic inches Gallons = Volume ÷ 231 cubic inches per gallon Gallons = 100,480 cubic inches ÷ 231 Gallons = 434.97 Incorrect answer. Please choose another answer.

590.	Your plumber has called and needs rock to fill a ditch. He says that he needs 3/4" clean rock, and the ditch is 50 feet long by 3 feet wide by 8-foot depth. How much rock should you order?
		a. 30 ton
		b. 40 ton
		c. 50 ton
		d. 60 ton
Tons of Rock = length x width x height x 100 ÷ 2,000 Tons of Rock = 50 x 3 x 8 x 100 ÷ 2,000 Tons of Rock = 60 ton Incorrect answer. Please choose another answer.

591.	A plumber calls and needs to order a section of glass pipe, but he is unsure of how to order this expensive pipe. He tells you that he is using 45° bends and he has an offset of 38 inches. What is the length of pipe you need to order?
		a. 53-1/2"
		b. 53-3/8"
		c. 53-3/4"
		d. 54"
Length of Glass Pipe = constant x offset Length of Glass Pipe = 1.414 x 38" Length of Glass Pipe = 53.73 or 53-3/4" 1.414 is a constant that is multiplied by the offset to get a 45-degree diagonal in pipe length. The 45 degrees offset is the most common offset used in the plumbing industry. Incorrect answer. Please choose another answer.

592.	You have rectangular septic tank that measures 6 feet long by 4 feet wide by 6 feet high. You are told that the tank must have a capacity to hold 900 gallons of liquid. What is the gallon capacity of the tank that you have?
		a. 925 gallons
		b. 965 gallons
		c. 1,050 gallons
		d. 1,080 gallons
Gallons = L x W x H x 7.5 Gallons = 6 x 4 x 6 x 7.5 = 1,080 gallons Incorrect answer. Please choose another answer.

593.	Your ruler on a plumbing blueprint measures a wall with a length of 12-1/2 inches. The blueprint has a scale using a 1/4 inch per foot. What is the length of the wall in feet?
		a. 45 feet
		b. 47 feet
		c. 50 feet
		d. 60 feet
Actual Length = Plan Measurement ÷ Scale Actual Length = 12.5 inches ÷ .25 inches per foot Actual Length = 50 feet Incorrect answer. Please choose another answer.

594.	What is the volume of a water tank, in cubic feet, that is a cylinder 8 feet in diameter and 12 feet high?
		a. 554.65
		b. 578.64
		c. 602.88
		d. 612.94
Volume = π x radius² x height v = 3.14 x 4 x 4 x 12 v = 602.88 Incorrect answer. Please choose another answer.

595.	You have an offset of 24 inches and you are making a 45° offset. What is the travel length?
		a. 30.65
		b. 31.52
		c. 33.93
		d. 34.80
Travel Length = constant x offset t = 1.414 x 24 inches t = 33.93 inches 1.414 is a constant that is multilied by the offset to get a 45-degree diagonal in pipe length. The 45 degrees offset is the most common offset used in the plumbing industry. Incorrect answer. Please choose another answer.

596.	What angle is made when you offset a sewer with a 1/16 bend?
		a. 22.5°
		b. 45°
		c. 60°
		d. 90°
Degree of Angle = Fitting x 360 degrees Degree of Angle = 1/16 x 360 degrees Degree of Angle = .063 x 360 degrees Degree of Angle = 22.68° Incorrect answer. Please choose another answer.

597.	A lead shower pan is to have a floor size of 30" x 36", and the pan is 6" deep. How many square feet are needed for the pan?
		a. 10 sq. ft.
		b. 12 sq. ft.
		c. 14 sq. ft.
		d. 16 sq. ft.
A = L x W A = 48 in x 42 in 12 in/ft 12 in/ft A = 4' x 3.5' A = 14 sq. ft. 30 x 36 is not used in the calculation. Rather, you must have a total pan dimension 48" x 42" to allow for the turn up at each corner (i.e. adding the 6" height from both sides, which would be 12", to the length and width). Incorrect answer. Please choose another answer.

598.	As the master plumber on the job, you are asked by the general contractor to set a sleeve in a poured perimeter wall. The pipe is 2". Use the minimum necessary slope to calculate the invert. The pipe is 18" to the top of the pipe at the highest point to the finished floor. From the starting point it travels 50' north, 40' west, 12' south and 75' west. What would the invert of the pipe be as it passes through the sleeve? (Disregard the thickness of the pipe wall)
		a. 47-1/2"
		b. 52"
		c. 64-1/4"
		d. 72-3/4"
First, you will need to know that 1/4" per foot is the grade/slope/pitch/fall. Second, you need to know that invert means bottom of the pipe. The top of the pipe at the high point is 18", plus 2" for the pipe diameter, then add all the offsets 50' + 40' + 12' + 75' = 177' 177' ÷ 4 = 44-1/4" fall 18" + 2" + 44-1/4" = 64-1/4" From the finished floor to the top is 18" at the high end. The pipe size is 2" in "diameter". The pipe run drops 44-1/4". The 44 is inches as well. Incorrect answer. Please choose another answer.

599.	What would the pressure be at the bottom of a water holding tank that is 24' tall, 20' in diameter and on a 24" tall pad?
		a. 6 psi
		b. 10 psi
		c. 24 psi
		d. 52 psi
Water pressure is based on the height only in this application. Head pressure is .43 pounds per foot of head. In this case, 24' x .43 = 10.32 psi. Incorrect answer. Please choose another answer.

600.	You need to determine the water pressure for a water outlet pipe that originates from a water tower. The pipe from the water tower descends 90 feet and then extends 10 feet horizontally. The pipe then turns 90 degrees and rises in elevation 40 feet from the base of the water tower to the outlet. What is the psi at the outlet?
		a. 12.84 psi
		b. 17.36 psi
		c. 21.7 psi
		d. 39.06 psi
First, determine the psi at the base of the water tower: 90 ft. x .434 = 39.06 psi Next, to determine the psi at the end of the riser, subtract the rise in elevation from the height of the water tower and multiply with the .434 constant: 90 ft. - 40 ft. = 50 ft. 50 ft. x .434 = 21.7 psi A rise in elevation decreases the pressure. Incorrect answer. Please choose another answer.