FREE Master Plumber Water Supply and Distribution Questions and Answers

Question 1

A master plumber is installing a water service for a new single-family residence.
The static water pressure from the municipal main is measured at 95 psi.
According to the International Plumbing Code (IPC), what is the required action?

Accepted Answer

Install a pressure-reducing valve (PRV) set to not exceed 80 psi.

Answer

Notify the water purveyor to lower the main pressure.

Answer

No action is required as 95 psi is acceptable for residential fixtures.

Answer

Install a booster pump to maintain consistent flow.

Question 2

Which of the following devices is specifically designed to be installed in a potable water piping system to absorb the high-pressure shock waves caused by the quick closing of valves?

Accepted Answer

Water hammer arrestor

Answer

Expansion tank

Answer

Pressure relief valve

Answer

Check valve

Question 3

A master plumber must protect the potable water supply for a commercial boiler that uses chemical additives for treatment. Which of the following backflow prevention assemblies provides the highest level of protection and is typically required for this high-hazard application?

Accepted Answer

Reduced Pressure Zone (RPZ) Assembly

Answer

Double Check Valve Assembly (DCVA)

Answer

Atmospheric Vacuum Breaker (AVB)

Answer

Pressure Vacuum Breaker (PVB)

Question 4

After completing the installation of a new water service line for a commercial building, what is the generally accepted procedure a master plumber must follow before the system can be put into service, according to most plumbing codes and health standards?

Accepted Answer

Fill the system with a chlorine solution, let it stand, flush, and test for residual chlorine.

Answer

Flush the system with hot water for a minimum of 30 minutes.

Answer

Purge the system with compressed air to remove debris.

Answer

Conduct a hydrostatic pressure test at 150 psi for 4 hours.

Question 5

To prevent excessive noise and erosion-corrosion within a copper potable water distribution system, what is the generally recommended maximum design velocity for cold water?

Accepted Answer

8 feet per second (fps)

Answer

4 feet per second (fps)

Answer

12 feet per second (fps)

Answer

2 feet per second (fps)

Question 6

Which of the following is a mandatory requirement for the discharge pipe connected to a temperature and pressure (T&P) relief valve on a water heater, according to the International Plumbing Code (IPC)?

Accepted Answer

The pipe must terminate unthreaded, no more than 6 inches above the floor or an approved receptor.

Answer

The pipe must be pitched to drain towards the valve to prevent freezing.

Answer

The pipe can be reduced in size from the valve outlet to the point of discharge.

Answer

The pipe must be threaded at its outlet to allow for a temporary hose connection.

A master plumber is installing a water service for a new single-family residence.The static water pressure from the municipal main is measured at 95 psi.According to the International Plumbing Code (IPC), what is the required action?

A master plumber is installing a water service for a new single-family residence.
The static water pressure from the municipal main is measured at 95 psi.
According to the International Plumbing Code (IPC), what is the required action?