FREE Journeyman Plumbers Plumbing Codes and Regulations Questions and Answers

Question 1

According to most plumbing codes, what is the MAXIMUM allowable lead content in pipes and fittings used for potable water systems?

Accepted Answer

0.25%

Answer

0.5%

Answer

1.0%

Answer

2.0%

Question 2

A plumber is installing a new water heater in a residential garage. According to most plumbing codes, what is the MINIMUM distance required between the water heater's ignition source and the garage floor, unless it is a sealed combustion unit?

Accepted Answer

18 inches

Answer

6 inches

Answer

12 inches

Answer

24 inches

Question 3

Which of the following describes the primary purpose of a backflow prevention device in a potable water system?

Accepted Answer

To prevent the contamination of the potable water supply by non-potable sources.

Answer

To regulate water pressure within the system.

Answer

To reduce sediment buildup in water lines.

Answer

To increase the flow rate to fixtures.

Question 4

A new commercial building requires a grease interceptor. Which of the following factors is MOST critical in determining the correct size of the interceptor according to plumbing codes?

Accepted Answer

The anticipated flow rate and grease retention capacity required.

Answer

The number of restrooms in the building.

Answer

The total volume of hot water used daily.

Answer

The type of flooring in the kitchen area.

Question 5

According to plumbing codes, what is the MINIMUM required slope for a 3-inch horizontal drainage pipe?

Accepted Answer

1/4 inch per foot

Answer

1/16 inch per foot

Answer

1/8 inch per foot

Answer

1/2 inch per foot

Question 6

A plumber is inspecting an existing residential plumbing system for code compliance. They notice that the water service pipe directly enters the building and then immediately connects to a water softener, which is then followed by the main shut-off valve. Which of the following is the MOST significant code violation in this setup?

Accepted Answer

The main shut-off valve is located AFTER the water softener.

Answer

The water softener is installed indoors.

Answer

The water service pipe is not deep enough.

Answer

The water softener uses salt pellets.