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

Under a kitchen sink cabinet

Answer

In an attic space above insulation

Answer

On the branch drain of a bathroom group

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

ABS plastic

Answer

Cast iron

Answer

PVC Schedule 40

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

To prevent back pressure in the upper floors

Answer

To vent individual fixture traps

Answer

To allow fresh air into the building drain

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

Individual back venting each closet

Answer

Installing a loop vent

Answer

Installing an AAV at each closet

Question 5

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

Accepted Answer

2 inches

Answer

1 inch

Answer

1.5 inches

Answer

3 inches

Question 6

How far above the flood level rim of a fixture must a vent pipe rise before offsetting horizontally?

Accepted Answer

6 inches

Answer

2 inches

Answer

4 inches

Answer

1 foot

Question 7

A combination waste and vent system is typically permitted for which type of fixture?

Accepted Answer

Floor drains and floor sinks

Answer

Water closets and urinals

Answer

Bathtubs and showers only

Answer

Lavatories and bidets only

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