CHAPTER 12

Question 1

Water at approximately _____ is required by a kitchen and laundry for sterilization.
Select one:

A.
60°C (140°F)

B.
120°C (248°F)

C.
80°C (176°F)

D.
90°C (194°F)

E.
100°C (212°F)

Answer 1

C.
80°C (176°F)

Question 2

Fusible plugs are made of materials that melt at a temperature of:
Select one:

A.
225°C (440°F)

B.
99°C (210°F)

C.
125°C (260°F)

D.
150°C (300°F)

E.
90°C (194°F)

Answer 2

B.
99°C (210°F)

Question 3

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:
Select one:

A.
The sudden stoppage of flow

B.
The release of entrapped air

C.
Thermal expansion

D.
Water hammer

E.
The pump discharge valve slamming shut

Answer 3

D.
Water hammer

Question 4

One of the methods employed to prevent backflow and control the cross connections is the:
Select one:

A.
Reduced temperature principal device

B.
Air globe

C.
Double check breaker

D.
Pressure vacuum breaker

E.
Atmospheric valve breaker

Answer 4

D.
Pressure vacuum breaker

Question 5

In the _____ system water is obtained directly from a municipal distribution system or from a private supply at approximately 420 kPa (60 psi).
Select one:

A.
Direct pressure

B.
Tank variable pressure

C.
Pressure with pneumatic tank

D.
Indirect constant pressure

E.
Tankless constant pressure

Answer 5

A.
Direct pressure

Question 6

The double check valve consists of two independently acting check valves that close in a pressure differential if the supply pressure is lower than the:
Select one:

A.
Downstream pressure

B.
Downstream volume

C.
Upstream temperature

D.
Downstream temperature

E.
Upstream pressure

Answer 6

A.
Downstream pressure

Question 7

Re-circulating hot water systems eliminates hot water stagnation and allows _____ to be available at the fixture sooner and with much less waste of water than is the case in a non-recirculating system.
Select one:

A.
Higher pressure

B.
Lower volumes

C.
Less water

D.
Hot water

E.
Higher volumes

Answer 7

D.
Hot water

Question 8

One of the methods employed to prevent backflow and control the cross connections is the:
Select one:

A.
Temperature vacuum breaker

B.
Double check valve

C.
Atmospheric valve breaker

D.
Air globe

E.
Reduced temperature principal device

Answer 8

B.
Double check valve

Question 9

Most plumbing regulations prohibit single pipe systems over _____ in length from a water heater.
Select one:

A.
20 m (66 ft)

B.
30 m (100 ft)

C.
10 m (33 ft)

D.
40 m (130 ft)

E.
60 m (200 ft)

Answer 9

B.
30 m (100 ft)

Question 10

Pressure reducing valves are placed on each floor where the pressure in the supply line exceeds:
Select one:

A.
250 kPa (36 psi)

B.
150 kPa (22 psi)

C.
450 kPa (65 psi)

D.
350 kPa (51 psi)

E.
550 kPa (80 psi)

Answer 10

E.
550 kPa (80 psi)

Question 11

An air gap is a physical separation between the free flowing discharge end of a potable water pipe and an open or non-pressure receiving vessel such as a:
Select one:

A.
Process vessel

B.
Sink or a bathtub

C.
Boiler

D.
Storage tank

E.
Mixing vat

Answer 11

B.
Sink or a bathtub

Question 12

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

A.
Over pressure in the system

B.
Inadequate heating of the water

C.
Venting off air released from water during heating

D.
Scale build-up in the system

E.
Flashing of water into steam when faucets are opened

Answer 12

E.
Flashing of water into steam when faucets are opened

Question 13

The combination pressure and temperature relief valve opens when the temperature of _____ is reached.
Select one:

A.
103°C (217°F)

B.
110°C (230°F)

C.
90°C (194°F)

D.
99°C (210°F)

E.
105°C (221°F)

Answer 13

D.
99°C (210°F)

Question 14

In the _____ system the maximum building demand for water is less than the maximum flow available from a municipal or local distribution system.
Select one:

A.
Tankless constant pressure

B.
Direct pressure

C.
Pressure with pneumatic tank

D.
Tank variable pressure

E.
Indirect constant pressure

Answer 14

A.
Tankless constant pressure

Question 15

A common type of water heater that incorporates an automatic gas-fired storage heater and features a single tank used for both heating and storing the water is the:
Select one:

A.
Direct hot water heater

B.
Instantaneous indirect heater

C.
Instantaneous heater

D.
Direct instantaneous hot water heater

E.
Indirect hot water heater

Answer 15

A.
Direct hot water heater

Question 16

A typical self-operating temperature regulator consists of a bulb, capillary, and a valve actuating bellows that is filled with a/an:
Select one:

A.
Vegetable oil

B.
Petroleum fluid

C.
Water

D.
Volatile fluid

E.
Wax

Answer 16

D.
Volatile fluid

Question 17

Plumbing codes limit the highest water pressure allowed in plumbing systems to;
Select one:

A.
350 kPa (50 psi)

B.
250 kPa (36 psi)

C.
150 kPa (22 psi)

D.
550 kPa (80 psi)

E.
450 kPa (65 psi)

Answer 17

D.
550 kPa (80 psi)

Question 18

The pressure system with pneumatic tank typically has a pump on/off control start of:
Select one:

A.
Low air pressure

B.
Below reserve storage level

C.
Low water level

D.
High air pressure

E.
High water level

Answer 18

C.
Low water level

Question 19

The pressure vacuum breaker consists of a single body containing a spring-loaded check valve and an internally loaded vacuum breaker that _____ whenever the pressure within the body approaches atmospheric pressure.
Select one:

A.
Closes to admit air

B.
Opens to admit air

C.
Closes to admit water

D.
Opens to admit water

E.
Opens to release pressure

Answer 19

B.
Opens to admit air

Question 20

As water moves vertically up the risers in the building it will lose approximately _____ for every meter (for every foot) in elevation.
Select one:

A.
10 kPa (1.5 psi)

B.
5 kPa (0.7 psi)

C.
25 kPa (3.6 psi)

D.
20 kPa (2.9 psi)

E.
15 kPa (2 psi)

Answer 20

A.
10 kPa (1.5 psi)

Question 21

The atmospheric vacuum breaker has a moving element that should the flow stop and water pressure is lost it _____ and break the siphon effect.
Select one:

A.
Opens to admit water

B.
Opens to admit air

C.
Opens to release pressure

D.
Closes to admit water

E.
Closes to admit air

Answer 21

B.
Opens to admit air

Question 22

The reduced pressure principal device consists of two independently acting check valves with an automatic operating _____ valve located between the two check valves.
Select one:

A.
Pressure increasing

B.
Pressure

C.
Pressure reducing

D.
Temperature differential relief

E.
Pressure differential relief

Answer 22

E.
Pressure differential relief

Question 23

Hot water between _____ is used for domestic purposes in the building.
Select one:

A.
60°C (140°F) and 70°C (158°F)

B.
70°C (158°F) and 80°C (176°F)

C.
50°C (120°F) and 60°C (140°F)

D.
80°C (176°F) and 90°C (194°F)

E.
40°C (104°F) and 50°C (120°F)

Answer 23

C.
50°C (120°F) and 60°C (140°F)

Question 24

Most plumbing fixtures need a minimum of _____ water flow pressure.
Select one:

A.
130 kPa (19 psi)

B.
120 kPa (17.5 psi)

C.
100 kPa (14.5 psi)

D.
90 kPa (14 psi)

E.
110 kPa (15 psi)

Answer 24

E.
110 kPa (15 psi)

Question 25

One of the methods employed to prevent backflow and control the cross connections is the:
Select one:

A.
Atmospheric valve breaker

B.
Double check breaker

C.
Air gap

D.
Reduced temperature principal device

E.
Temperature vacuum breaker

Answer 25

C.
Air gap

Question 26

One of the methods employed to prevent backflow and control the cross connections is the:
Select one:

A.
Atmospheric valve breaker

B.
Temperature vacuum breaker

C.
Reduced pressure principal device

D.
Air globe

E.
Double check breaker

Answer 26

C.
Reduced pressure principal device

Question 27

The temperature relief device opens when the water temperature rises too approximately:
Select one:

A.
90°C (194°F)

B.
110°C (230°F)

C.
105°C (221°F)

D.
103°C (217°F)

E.
99°C (210°F)

Answer 27

E.
99°C (210°F)

Question 28

One of the methods employed to prevent backflow and control the cross connections is the:
Select one:

A.
Air globe

B.
Reduced temperature principal device

C.
Temperature vacuum breaker

D.
Atmospheric vacuum breaker

E.
Double check breaker

Answer 28

D.
Atmospheric vacuum breaker

Question 29

The pressure in the building plumbing system should not drop below _____ at any location.
Select one:

A.
200 kPa (29 psi)

B.
250 kPa (36 psi)

C.
150 kPa (22 psi)

D.
300 kPa (44 psi)

E.
175 kPa (25 psi)

Answer 29

E.
175 kPa (25 psi)

Question 30

The pressure system with pneumatic tank typically has a pump on/off pressure differential of:
Select one:

A.
120 kPa (17.4 psi)

B.
180 kPa (26 psi)

C.
140 kPa (20 psi)

D.
100 kPa (14.5 psi)

E.
160 kPa (23.2 psi)

Answer 30

C.
140 kPa (20 psi)