PC Plumber Water & Drainage 3

Question 1

What is the minimum size of a building sewer that serves a single-family home under the IPC?

Accepted Answer

4 inches

Answer

2 inches

Answer

3 inches

Answer

6 inches

Question 2

What is the term for negative pressure in a drain system that pulls water out of fixture traps?

Accepted Answer

Siphonage

Answer

Back pressure

Answer

Water hammer

Answer

Hydraulic jump

Question 3

A plumber installs a dishwasher drain. Where must the drain hose be routed before connecting to the drain or disposal?

Accepted Answer

In a high loop or through an air gap above the flood level rim of the sink

Answer

Directly through the cabinet floor

Answer

Through a P-trap before the disposal

Answer

Directly to the floor drain

Question 4

What type of vent serves as both a drain and a vent for the same fixture?

Accepted Answer

Wet vent

Answer

Common vent

Answer

Circuit vent

Answer

Relief vent

Question 5

Under the IPC, what is the minimum water pressure required at the point of use for a residential fixture?

Accepted Answer

20 psi

Answer

15 psi

Answer

40 psi

Answer

60 psi

Question 6

What is the correct way to orient a sanitary tee when used in a horizontal drain line?

Accepted Answer

Outlet pointing up (upright)

Answer

Outlet pointing down (inverted)

Answer

Outlet at 45 degrees

Answer

Outlet pointing horizontally

Question 7

Which material is NOT approved for use as a DWV (drain, waste, and vent) pipe under the IPC?

Accepted Answer

CPVC

Answer

ABS plastic

Answer

PVC plastic

Answer

Cast iron