Journeyman Plumbers Exam Drainage, Waste, and Venting 3

Question 1

An air admittance valve (AAV) may NOT be used as the sole means of venting in which location?

Accepted Answer

As the vent for a building sewer

Answer

AAVs cannot be used to vent a building sewer because they are one-way devices and do not allow sewer gases to escape to atmosphere.

Question 2

Which pipe material is NOT approved for use in above-ground DWV systems under the UPC?

Accepted Answer

Galvanized steel drain pipe

Answer

Galvanized steel is not listed for DWV use because it corrodes internally from waste gases and restricts flow over time.

Question 3

What is the purpose of a relief vent in a tall building stack?

Accepted Answer

To relieve positive pressure at the base of the stack

Answer

A relief vent connects the soil stack to the vent stack near the base to relieve the positive pressure that builds at the bottom of a tall stack.

Question 4

When two or more water closets are on the same horizontal branch, which venting method is most efficient?

Accepted Answer

Using a circuit vent with a relief vent

Answer

A circuit vent with a relief vent efficiently serves a battery of water closets on the same horizontal branch, reducing pipe runs.

Question 5

What is the minimum vent pipe size for a water closet?

Accepted Answer

2 inches

Answer

The minimum vent pipe size for a water closet is 2 inches per most plumbing codes, including the UPC.

Journeyman Plumbers Exam Practice Test