2021 Edition

Plumbing Practice Test

This free plumbing practice test will give you an idea of the types of questions that appear on actual plumbing licensing exams. Plumbing exams vary by state but most all states and local plumbing jurisdictions have adopted either the IPC or the UPC plumbing codes. Typical exam sections include: fixtures, sanitary drainage systems, administrative policies, venting, indirect and special wastes, etc.

Administrative Policies and Procedures

1. A plumbing permit is required for the replacement of which of the following?
2. The provisions for licensing are determined by which of the following:

General Regulations

3. Which of the following is suitable for testing a DWV system for leaks?
4. All pipe used in plumbing applications will have all of the following markings except:


5. What is the likely height of a handicap toilet?
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6. What is the minimum unobstructed opening of egress when a shower door is installed for a typical shower?

Indirect and Special Wastes

7. Which of the following is considered to be the best method for connecting an indirect waste to a sanitary drainage system?
8. The minimum vertical distance from the bottom of an indirect drain line to its receptor's flood rim is _____________________________.

Vents and Venting

9. Which of the following types of fixtures can be served by a combination-waste-and-vent system?
10. You are connecting two back to back lavatories, two urinals and two water closets to one horizontal branch. What are the maximum number fixtures that can be connected to a horizontal branch?
11. Piping for building drains and horizontal drainage branches require the installation of cleanouts. Spacing for these cleanouts is determined by the diameter of the drain and other factors. In this scenario the drain pipe diameter is three inches. This drain has a running length of 77 feet. During this run the pipe takes one 90-degree turn. How many cleanouts are required for this installation?

Traps and Cleanouts

12. One trap arm may serve a total of how many P-traps?
13. Flexible water connections are required to be _________.
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Water Supply and Distribution

14. Water heaters, hose bibs and sill cocks are normally protected from backflow with ________.

Sanitary Drainage Systems

15. What is the typical amount of grade required per liner foot on a household drainage pipe?
16. What will result when a 4 inch pipe is reduced in size in the direction of the flow?

Special Piping and Storage Systems

17. In Med Gas systems, the exhaust from vacuum pumps must be discharged into the following:
18. Flux can only be used in the brazing process when:

Water Heaters

19. Where is the maximum allowable working pressure of a storage tank and water heater required to be shown?
20. The minimum depth thickness for a water heater drip pan is __________________________.

Recycling Gray Water

21. Gray water that enters a collection reservoir must be ________.
22. What is the maximum amount of time that gray water is allowed to be retained for use to flush a toilet or urinal?

Fuel Gas

23. Gas piping installed in a laundry chute ____________.
24. When flow controls are installed on gas piping, they _____________.


25. What is the angle made when you offset a sewer with a 1/8 bend?
26. What is the total pressure in pound per square inch (psi) on a 6 inch diameter test plug with a water head of 15 feet?

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