PC Plumber Water & Drainage 2

Question 1

What is the minimum slope required for a 4-inch horizontal drain pipe under the IPC?

Accepted Answer

1/8 inch per foot

Answer

1/16 inch per foot

Answer

1/4 inch per foot

Answer

1/2 inch per foot

Question 2

Which type of pipe joint is used to connect cast iron soil pipe using a rubber gasket and stainless steel clamp?

Accepted Answer

No-hub coupling

Answer

Caulked lead joint

Answer

Spigot and bell joint

Answer

Compression fitting

Question 3

A P-trap must have its water seal depth within which range?

Accepted Answer

2 to 4 inches

Answer

1 to 2 inches

Answer

4 to 6 inches

Answer

6 to 8 inches

Question 4

What is the purpose of an air admittance valve (AAV) in a drainage system?

Accepted Answer

To allow air into the drain to equalize pressure without a traditional vent

Answer

To pressurize the drainage stack

Answer

To prevent backflow in the main sewer line

Answer

To reduce water hammer in supply lines

Question 5

When installing a shower drain, the drain flange must be set at what height relative to the finished floor?

Accepted Answer

Flush with or slightly below

Answer

1/2 inch above

Answer

1 inch above

Answer

2 inches below

Question 6

What is the maximum distance a fixture trap can be from its vent under most plumbing codes?

Accepted Answer

8 feet

Answer

2 feet

Answer

6 feet

Answer

10 feet

Question 7

Which drainage fitting must be used when changing direction from horizontal to vertical in a drain line?

Accepted Answer

Long sweep 1/4 bend

Answer

Short sweep 1/4 bend

Answer

Sanitary tee

Answer

Wye with 1/8 bend