19 terms

Chapter 111 • Building Water Supply Systems

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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)
b
When supply pressure is inadequate for upper floors, and when the maximum building demand for water is always less than the maximum flow available from a municipal or local distribution system, which of the following systems can be used?

a) Tankless constant pressure
b) Constant pressure system with a suction tank
c) Direct pressure system
d) Constant pressure system with a pneumatic tank
a
Temperature relief devices are effective in eliminating the following problem

a) scale build-up in the system.
b) flashing of water into steam when faucets are opened. c) venting off air released from water during heating.
d) inadequate heating of the water.
b
An air gap is a __________________ 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.

a) pump suction
b) top of the storage tank
c) pump discharge
d) highest point in the system
b
Fusible plugs are made of materials that melt at a temperature of

a) 150°C (300°F)
b) 125°C (260°F)
c) 225°C (440°F)
d) 99°C (210°F)
d
Which of the following statements about a constant pressure system with Pneumatic Tank is false?

a) Water entering directly into the pump suction is
discharged into pressurized tank.
b) This system is primarily used in larger buildings.
c) A system controller automatically starts a standby pump
in the event of pump failure.
d) The system has a pressure regulator to maintain a
relatively constant pressure above the water level
inside the tank.
e) Air must continuously be introduced into the tank.
b
The system which has a storage tank above the highest fixture in the system is called

a) an upfeed system
b) a constant pressure system with suction tank
c) a tankless constant pressure system
d) a downfeed system
e) a direct pressure system
d
Which of the following statements about Non-Circulating hot water systems is true?


a) The systems have a return line.
b) The systems are used in large residential buildings.
c) The systems eliminate hot water stagnation.
d) The systems contain a differential fire recoil element.
e) The systems force large amounts of water to be wasted
before hot water is available in each fixture.
e
Which of the following is not an element found in a
circulating hot water system?

a) A fire recoil element
b) Air vents
c) Heaters
d) Back flow valves
e) Return Piping
a
In a circulating hot water system the municipal distribution
systems and/or local storage tanks are used for which of the following reasons.

a) Cold water supply only
b) Water supply to heaters only
c) Hot water supply from municipal heating stations
d) Both cold water and heater water supply
e) Water meter rationing
b
In a circulating hot water system automatic air vents serve
which of the following functions?

a) They cool the water in the storage tank to increase the
temperature differential to increase circulation.
b) They remove air that is released when water is heated.
c) They supply air to cooling water in the storage tank.
d) They are required for adequate water aeration.
e) None of the above.
b
The backflow prevention method which consists of two
independently acting check valves with an automatic operating pressure differential relief valve located between the two check valves is called

a) air gap backflow prevention
b) double check valve
c) reduced pressure principal device
d) atmosphere vacuum breaker
e) PVB
c
Which of the following statements about pressure relief
valves is false?

a) The valve may be installed anywhere in the hot water
system close to the heater or tank.
b) The valve must be directly connected to a drain or vent
pipe.
c) The valve is opened by pressure in the line surpassing a
preset pressure set on the spring in the valve.
d) The valve is automatically closed when the water line
pressure drops below the spring pressure setting.
e) None of the above.
b
Most municipal water distribution systems operate at pressures between:
a) 350 and 490 kPa
b) 250 and 490 kPa
c) 150 and 500 kPa
d) 0 and 100 kPa
e) 20 and 90 kPa
a
Most building regulations prohibit single pipe systems over ____ in length from a hot water heater or hot water recirculating line.
a) 10.5m b) 12. 2m c) 15.2m d) 20.5m e) 25.5m
c
Temperature relief devices limit the temperature in domestic hot water systems to no more than

a) 50C b) 79C c) 90C d) 99C e) 121C
d
Building codes generally limit the highest pressure permissible in a plumbing systems to:

a) 350 kPa b) 490 kPa c) 500 kPa d) 560 kPa e) 600 kPa
d
An air gap is a ______ 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

a) siphon
b) physical separation
c) vent
d) low point
b
Which of the following statements about a constant pressure system with Pneumatic Tank is false?

a) Water entering directly into the pump suction is discharged into pressurized tank.
b) This system is primarily used in larger buildings.
c) A system controller automatically starts a standby pump in the event of pump failure.
d) The system has a pressure regulator to maintain a relatively constant pressure above the water level inside the tank.
e) Air must continuously be introduced into the tank
b