CHAPTER 12 Flashcards
(30 cards)
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)
C.
80°C (176°F)
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)
B.
99°C (210°F)
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
D.
Water hammer
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
D.
Pressure vacuum breaker
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
A.
Direct pressure
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
A.
Downstream pressure
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
D.
Hot water
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
B.
Double check valve
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)
B.
30 m (100 ft)
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)
E.
550 kPa (80 psi)
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
B.
Sink or a bathtub
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
E.
Flashing of water into steam when faucets are opened
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)
D.
99°C (210°F)
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
A.
Tankless constant pressure
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
A.
Direct hot water heater
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
D.
Volatile fluid
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)
D.
550 kPa (80 psi)
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
C.
Low water level
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
B.
Opens to admit air
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)
A.
10 kPa (1.5 psi)
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
B.
Opens to admit air
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
E.
Pressure differential relief
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)
C.
50°C (120°F) and 60°C (140°F)
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)
E.
110 kPa (15 psi)
