Chapter 36 Building Water Supply Systems

Question 1

The pressure in the building plumbing system should not drop below _________ at any location.

a) 150 kPa (20 psi)
b) 175 kPa (25 psi)
c) 250 kPa (35 psi)
d) 300 kPa (42 psi)

Answer 1

b) 175 kPa (25 psi)

Question 2

A __________ operates by starting and stopping the pump on an intermittent basis to maintain pressure in the hydropneumatic tank.

a) low water cut-out
b) temperature controller
c) pressure switch
d) level controller

Answer 2

c) pressure switch

Question 3

Temperature relief devices are effective in eliminating which of the following problem.

a) Scale build-up in the system
b) Dangerously high water temperature
c) Venting air released from water during heating
d) Inadequate heating of the water

Answer 3

b) Dangerously high water temperature

Question 4

A physical separation between the free flowing discharge end of a potable water pipe and an open vessel such as a sink or bathtub is called a(n) ______________.

a) p-trap
b) air gap
c) point of release
d) vacuum breaker

Answer 4

b) air gap

Question 5

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 is:

a) from the release of entrapped air
b) the pump discharge valve slamming shut
c) normal in most buildings
d) water hammer

Answer 5

d) water hammer

Question 6

An over-sized recirculating pump in a hot water system can produce ___________.

a) water hammer
b) too much system pressure
c) cavitation
d) leaks in the system

Answer 6

c) cavitation

Question 7

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 7

a) 99 C (210 F)