Book 2: 2-12 - "Building Water Supply Systems"

Question 1

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. 450 kPa (65 psi)

E. 550 kPa (80 psi)

Answer 1

E. 550 kPa (80 psi)

Question 2

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

A. 130 kPa (19 psi)

B. 100 kPa (14.5 psi)

C. 120 kPa (17.5 psi)

D. 90 kPa (14 psi)

E. 110 kPa (15 psi)

Answer 2

E. 110 kPa (15 psi)

Question 3

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. Less water

C. Higher volumes

D. Lower volumes

E. Hot water

Answer 3

E. Hot water

Question 4

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

A. 70°C (158°F) and 80°C (176°F)

B. 50°C (120°F) and 60°C (140°F)

C. 80°C (176°F) and 90°C (194°F)

D. 40°C (104°F) and 50°C (120°F)

E. 60°C (140°F) and 70°C (158°F)

Answer 4

B. 50°C (120°F) and 60°C (140°F)

Question 5

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

A. 150 kPa (22 psi)

B. 250 kPa (36 psi)

C. 450 kPa (65 psi)

D. 350 kPa (51 psi)

E. 550 kPa (80 psi)

Answer 5

E. 550 kPa (80 psi)

Question 6

Backflow in a potable water supply is the _____ of water or other liquid, gas, mixture, or other substance into the distributing pipes.
Select one:

A. Change in pressure

B. Reversal of temperature

C. Reversal of the direction of the normal flow

D. Reversal of pressure

E. Change of temperature

Answer 6

C. Reversal of the direction of the normal flow

Question 7

In the _____ system water enters directly into the pump suction and* is discharged into a pressurized tank from there it flows into the building cold water system.
Select one:

A. Tank variable pressure

B. Indirect constant pressure

C. Direct pressure

D. Pressure with pneumatic tank

E. Tankless constant pressure

Answer 7

D. Pressure with pneumatic tank

Question 8

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

A. Inadequate heating of the water

B. Flashing of water into steam when faucets are opened

C. Over pressure in the system

D. Venting off air released from water during heating

E. Scale build-up in the system

Answer 8

C. Over pressure in the system

Question 9

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

A. Double check breaker

B. Air globe

C. Atmospheric vacuum breaker

D. Reduced temperature principal device

E. Temperature vacuum breaker

Answer 9

C. Atmospheric vacuum breaker

Question 10

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

A. 140 kPa (20 psi)

B. 180 kPa (26 psi)

C. 120 kPa (17.4 psi)

D. 160 kPa (23.2 psi)

E. 100 kPa (14.5 psi)

Answer 10

A. 140 kPa (20 psi)

Question 11

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. Thermal expansion

B. The sudden stoppage of flow

C. Water hammer

D. The release of entrapped air

E. The pump discharge valve slamming shut

Answer 11

C. Water hammer

Question 12

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. Petroleum fluid

B. Wax

C. Water

D. Volatile fluid

E. Vegetable oil

Answer 12

D. Volatile fluid

Question 13

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. Indirect constant pressure

B. Pressure with pneumatic tank

C. Tank variable pressure

D. Direct pressure

E. Tankless constant pressure

Answer 13

E. Tankless constant pressure

Question 14

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. Mixing vat

B. Storage tank

C. Process vessel

D. Sink or a bathtub

E. Boiler

Answer 14

D. Sink or a bathtub

Question 15

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

A. 90°C (194°F)

B. 225°C (440°F)

C. 125°C (260°F)

D. 99°C (210°F)

E. 150°C (300°F)

Answer 15

D. 99°C (210°F)

Question 16

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

A. Reduced pressure principal device

B. Atmospheric valve breaker

C. Air globe

D. Double check breaker

E. Temperature vacuum breaker

Answer 16

A. Reduced pressure principal device

Question 17

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

A. 10 m (33 ft)

B. 20 m (66 ft)

C. 60 m (200 ft)

D. 40 m (130 ft)

E. 30 m (100 ft)

Answer 17

E. 30 m (100 ft)

Question 18

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

A. 105°C (221°F)

B. 103°C (217°F)

C. 110°C (230°F)

D. 99°C (210°F)

E. 90°C (194°F)

Answer 18

D. 99°C (210°F)

Question 19

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

A. 175 kPa (25 psi)

B. 300 kPa (44 psi)

C. 250 kPa (36 psi)

D. 200 kPa (29 psi)

E. 150 kPa (22 psi)

Answer 19

A. 175 kPa (25 psi)

Question 20

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 instantaneous hot water heater

B. Instantaneous indirect heater

C. Indirect hot water heater

D. Direct hot water heater

E. Instantaneous heater

Answer 20

D. Direct hot water heater