Chapter 12

Question 1

Name the three most common feed water systems.

a) Gravity feed system, Manual feed system, Electric feed system
b) Direct pressure system, Tankless constant pressure system, Pressure system with pneumatic tank
c) Vacuum feed system, Hydraulic feed system, Thermal feed system d) Magnetic feed system, Solar feed system, Steam feed system

Answer 1

B

Question 2

The pressure in the building plumbing system should not drop below blank at any location.
A. 150 kPa, [20 psi]
B. 175 kPa, [25 psi]
C. 250 kPa, [35 psi]
D. 300 kPa, [42 psi]

Answer 2

B

Question 3

A pressure switch operates by __________________________________ within preset minimum and maximum pressure settings.

Answer 3

Starting and stopping the pump on an intermittent basis to maintain the water pressure in the hydropneumatic [water and air] tanks.

Question 4

Temperature relief devices are effective in eliminating which of the following?
A. Scale buildup in the system.
B. Flashing of water into steam when faucets are opened.
C. Venting air released from the water during heating.
D. Inadequate heating of the water.

Answer 4

B

Question 5

An air gap is a blank between the free-flowing discharge end of a potable water pipe and an open or non-pressure receiving vessel, such as a sink or bathtub.

Answer 5

Physical separation.

Question 6

The pounding or banging of pipes and shuddering of fixtures caused by a shock wave resulting from a sudden stop of water flow in a pipe results in
A. Release of entrapped air
B. Pump discharge valve slamming shut
C. Sudden stoppage of flow
D. Water hammer

Answer 6

D

Question 7

The oversized pump can produce ____________

Answer 7

Cavitation through the pump and in the surrounding piping.

Question 8

Fusible plugs are made of materials that melt at a temperature of _____.
A. 99°C (210°F)
B. 150°C (300°F)
C. 125°C (260°F)
D. 225°C (440°F)

Answer 8

A