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Plumber's Licensing Exam: Vents
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Plumber's Licensing Exam: Vents
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25 Questions

1. If a kitchen sink must be drained through a combination drain and vent system, what will be the pipe size of the vertical portion of the drain?
2. Self-siphonage is a problem with
3. What is the maximum venting system design target for pressures created in the vent system?
4. There is no limit on the number of fixture units that can be discharged into one branch interval of a 3-in. waste stack as long as the load for the stack is not exceeded.
5. What is the smallest size vent permitted for a 4-in. stack?
6. A trap weir that has a 2-in. diameter can be _________ feet from a vent.
7. A waste stack must remain the same diameter throughout its length.
8. A trap weir that has a 3-in. diameter can be _________ feet from a vent.
9. A circuit vent must be connected to the waste line between the fixture furthest upstream and the next fixture downstream.
10. It is not permitted to drain an attic condensate pipe into a vent pipe.
11. A waste stack must have a stack vent.
12. Horizontal vent pipes must be sloped
13. A crown vent is
14. Air admittance valves are approved for use on kitchen sinks.
15. Any type of fixture can be installed using a combination drain and vent.
16. If there is greater than 2 in. WC vacuum in a properly sized and installed vent system, what is a likely cause?
17. A common application of a combination drain and vent system is
18. A combination drain and vent system is used
19. How high is the highest portion of an island fixture vent?
20. Sheet copper for vent pipe flashing must weigh at least
21. The materials used for vents must be selected according to the same chart as that for drainage piping.
22. A urinal can be connected to a combination drain and vent pipe.
23. The greatest pressure differential allowed against a trap is
24. If a roof has other uses besides weather protection, the vent termination must be _______ feet above the roof.
25. How many DFUs can be drained through a 3-in. combination drain and vent pipe that connects to a stack?

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