Power Engineering - 4B8 Practice Questions With Complete
Solutions
The back flow prevention method consisting of two independent
check valves with an automatic operating pressure differential
relief valve located between them is called:
a. Air gap back flow prevention
b. Double check valve
c. Reduced pressure principle device
d. Atmosphere vacuum breaker
c. Reduced pressure principle device
The NFPA Life Safety Code requires that emergency lighting be
provided for means of exit in:
a. Places of assembly of less than 300 people
b. All rental properties
c. Office buildings with occupancies of 300 or more people
d. All educational occupancies
d. All educational occupancies
Corrugations in outside aluminum storm water piping are
required to:
a. Increase the flow of storm water
b. Decrease potential for blockage
,c. Allow flexibility to prevent wind damage
d. Permit expansion of the aluminum
d. Permit expansion of the aluminum
Non-circulating potable hot water systems:
a. waste large amounts of water before hot water is available at
the fixtures
b. are used in large commercial buildings
c. eliminate hot water stagnation
d. require a hot water return line
a. waste large amounts of water before hot water is available at
the fixtures
Temperature relief devices are effective in protecting domestic
hot water systems from:
a. Scale build up in the system
b. Flashing of water to steam when faucets are opened
c. Venting off air released from water during heating
d. Inadequate heating of the water
b. Flashing of water to steam when faucets are opened
In large buildings, approximately what percentage of the
electrical load is lighting?
a. 60%
b. 40%
,c. 70%
d. 20%
a. 60%
A common plumbing trap has a water seal depth of:
a. 5 cm
b. 10 cm
c. The inside diameter of the pipe
d. The outside diameter of the pipe
a. 5 cm
Negative pressure in a sanitary drainage system may result in:
a. Clogging of drain pipes
b. Build up of scale in water closets
c. Loss of trap sealing water
d. Forcing of sewer gases through traps
c. Loss of trap sealing water
A deep seal plumbing trap has a water seal depth of:
a. 5 cm
b. 10 cm
c. The outside diameter of the pipe
d. The inside diameter of the pipe
b. 10 cm
Most dimmer switches sold today:
, a. Divert some current through a variable resistor
b. Can be used with both incandescent or fluorescent lighting
c. Are solid state devices
d. Control lighting levels in response to changing levels of
daylight.
c. Are solid state devices
A luminaire is
a. a measurement of reflected light
b. a measurement of refracted light
c. the SI term for "candle power"
d. a complete lighting unit
d. a complete lighting unit
Which of the following has a trap as an integral part of the
fixture?
a. A toilet
b. A sink
c. A roof drain
d. A bathtub
a. A toilet
What is the simplest way to stop sewer gas from coming out of
floor drains?
a. Pour a pail of water into the drain
b. Cover the drain opening
Solutions
The back flow prevention method consisting of two independent
check valves with an automatic operating pressure differential
relief valve located between them is called:
a. Air gap back flow prevention
b. Double check valve
c. Reduced pressure principle device
d. Atmosphere vacuum breaker
c. Reduced pressure principle device
The NFPA Life Safety Code requires that emergency lighting be
provided for means of exit in:
a. Places of assembly of less than 300 people
b. All rental properties
c. Office buildings with occupancies of 300 or more people
d. All educational occupancies
d. All educational occupancies
Corrugations in outside aluminum storm water piping are
required to:
a. Increase the flow of storm water
b. Decrease potential for blockage
,c. Allow flexibility to prevent wind damage
d. Permit expansion of the aluminum
d. Permit expansion of the aluminum
Non-circulating potable hot water systems:
a. waste large amounts of water before hot water is available at
the fixtures
b. are used in large commercial buildings
c. eliminate hot water stagnation
d. require a hot water return line
a. waste large amounts of water before hot water is available at
the fixtures
Temperature relief devices are effective in protecting domestic
hot water systems from:
a. Scale build up in the system
b. Flashing of water to steam when faucets are opened
c. Venting off air released from water during heating
d. Inadequate heating of the water
b. Flashing of water to steam when faucets are opened
In large buildings, approximately what percentage of the
electrical load is lighting?
a. 60%
b. 40%
,c. 70%
d. 20%
a. 60%
A common plumbing trap has a water seal depth of:
a. 5 cm
b. 10 cm
c. The inside diameter of the pipe
d. The outside diameter of the pipe
a. 5 cm
Negative pressure in a sanitary drainage system may result in:
a. Clogging of drain pipes
b. Build up of scale in water closets
c. Loss of trap sealing water
d. Forcing of sewer gases through traps
c. Loss of trap sealing water
A deep seal plumbing trap has a water seal depth of:
a. 5 cm
b. 10 cm
c. The outside diameter of the pipe
d. The inside diameter of the pipe
b. 10 cm
Most dimmer switches sold today:
, a. Divert some current through a variable resistor
b. Can be used with both incandescent or fluorescent lighting
c. Are solid state devices
d. Control lighting levels in response to changing levels of
daylight.
c. Are solid state devices
A luminaire is
a. a measurement of reflected light
b. a measurement of refracted light
c. the SI term for "candle power"
d. a complete lighting unit
d. a complete lighting unit
Which of the following has a trap as an integral part of the
fixture?
a. A toilet
b. A sink
c. A roof drain
d. A bathtub
a. A toilet
What is the simplest way to stop sewer gas from coming out of
floor drains?
a. Pour a pail of water into the drain
b. Cover the drain opening
