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Plumber's Licensing Exam: Practice Test 3
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Plumber's Licensing Exam: Practice Test 3
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25 Questions

1. One trap shall be permitted to serve a set of not more than three single-compartment sinks as long as the waste outlets are not more than _____ in. apart.
2. Which of the following types of material should not be used in potable water distribution piping?
3. Where a roof is being used only for weather protection, the vent shall terminate __________ feet above the roof.
4. Closet bolts must be made of which material?
5. What is the minimum diameter allowed for a drain to which a food waste grinder is connected?
6. Which of these is not an approved material for a bathtub?
7. An air gap is an acceptable substitute for an air break.
8. What is the maximum length allowed for an indirect drain from a refrigeration coil?
9. A valve is required on the _________________ pipe of a water heater.
10. No more than 12 fixture units can be discharged into one branch interval of a 3-in. waste stack.
11. In public restroom facilities, the interior walls and surfaces must be
12. What is the purpose of an air gap?
13. Fixtures that vent must transition horizontally a minimum of ______ in. above the flood level rim of the fixtures.
14. A(n) ________________________ can be used to protect an irrigation system from backflow.
15. When must a grease interceptor be installed?
16. When installing a temperature and pressure relief valve on a tank-type water heater, where must it be installed?
17. A sump pit must be at least __________ deep.
18. When is it appropriate to thread schedule 40 PVC pipe to make connections?
19. Hot water temperature maintenance is required for pipes longer than 50 ft.
20. Water drained from a ________________ is considered gray water.
21. A water pump in a basement
22. When you add 7/8 in. and 1/2 in., it equals
23. What is the largest-size solid waste allowed through a strainer plate?
24. The seat on a water closet must be
25. The smallest openings in strainer plates on drain inlets must be

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