Journeyman Plumbers General Plumbing Regulations Questions and Answers

Question 1

Under which of the following circumstances is a combination waste and vent system typically permitted by most plumbing codes?

Accepted Answer

For floor drains and sinks in specific applications like laboratories where conventional venting is structurally impractical.

Answer

As a primary venting method for multi-story residential buildings to save on piping materials.

Answer

In any commercial kitchen application involving three-compartment sinks and food waste disposers.

Answer

For venting any residential bathroom group, including toilets, lavatories, and showers.

Question 2

A journeyman plumber is installing a horizontal run of 2-inch Schedule 40 PVC drainpipe. According to the International Plumbing Code (IPC), what is the MAXIMUM allowable spacing between hangers or supports for this pipe?

Accepted Answer

Every 4 feet

Answer

Every 2 feet

Answer

Every 5 feet

Answer

Every 10 feet

Question 3

When performing a water test on a newly installed DWV (Drain, Waste, and Vent) system, what is the minimum required head of water that must be applied to the system and for what duration, according to the IPC?

Accepted Answer

10 feet of head for 15 minutes.

Answer

5 feet of head for 10 minutes.

Answer

The system must be filled to the point of overflow for 5 minutes.

Answer

A head equal to a 2-story building (approx. 20 feet) for 30 minutes.

Question 4

A plumber is installing a 4-inch horizontal building drain that makes a single 90-degree turn. Which of the following statements about cleanout requirements is correct according to most plumbing codes?

Accepted Answer

A cleanout is required at each change of direction greater than 45 degrees.

Answer

A cleanout is only required if the total length of the drain exceeds 100 feet.

Answer

A cleanout can be omitted if two 45-degree fittings are used to make the turn.

Answer

A cleanout is not required if a fixture with a removable trap is located within 5 feet of the turn.

Question 5

Which of the following is explicitly PROHIBITED by code for the discharge pipe of a water heater's Temperature and Pressure (T&P) relief valve?

Accepted Answer

Installing any type of shutoff valve or tee fitting in the line.

Answer

Terminating the pipe 6 inches above a floor drain.

Answer

Constructing the pipe from approved materials like copper or CPVC.

Answer

Pitching the pipe downwards to allow for drainage by gravity.

Question 6

A plumber is setting a water closet in a residential bathroom. According to the International Plumbing Code (IPC), what is the MINIMUM required clearance from the centerline of the water closet to an adjacent side wall or vanity?

Accepted Answer

15 inches

Answer

12 inches

Answer

18 inches

Answer

21 inches