Plumbing Water Supply Systems

Question 1

What is the minimum water pressure required at a residential fixture per the IPC?

Accepted Answer

20 psi

Answer

15 psi

Answer

40 psi

Answer

60 psi

Question 2

What is the maximum water pressure allowed at a residential service entrance without a pressure reducing valve (PRV)?

Accepted Answer

80 psi

Answer

60 psi

Answer

100 psi

Answer

125 psi

Question 3

What device is required to prevent backflow where a hose bib connects to a garden hose?

Accepted Answer

Vacuum breaker

Answer

Pressure reducing valve

Answer

Check valve

Answer

Gate valve

Question 4

What is the purpose of a pressure reducing valve (PRV) in a residential plumbing system?

Accepted Answer

To reduce high incoming water pressure to a safe level

Answer

To boost low water pressure

Answer

To prevent water hammer

Answer

To filter sediment from water

Question 5

Which type of water heater heats water only when it is needed, without a storage tank?

Accepted Answer

Tankless (on-demand) water heater

Answer

Heat pump water heater

Answer

Solar water heater

Answer

Storage tank water heater

Question 6

What is 'water hammer' and what device prevents it?

Accepted Answer

Pressure spike from sudden valve closure; prevented by a water hammer arrestor

Answer

Corrosion in pipes; prevented by a filter

Answer

Frozen pipe noise; prevented by insulation

Answer

Air in supply lines; prevented by a pressure regulator