FDNY Z51 Practice Test
What is the function of a cylinder bypass? To allow operation at different capacities
The chilled water supply to the building is 55F. If the Yes. this temperature is too high for human comfort purpose
chiller is being used for human comfort, should you be
concerned about this, and why?
The packing gland of a centrifugal pump serves to: The drip part of the packing gland gives evidence that there is water in the
pump
Capacity control of a reciprocating hermetic Operation of the hot gas bypass valve
compressor is typically achieved through
The most important reason to sub-cool the refrigerant A pure liquid refrigerant will enter the metering device
in the condenser is to ensure that:
A refrigeration engineer is logging reading from a An expansion valve that is open to wide
reciprocating system. compressor discharge
temperature have dropped significantly and the suction
line pressure is high. which of the following that may be
causing this set of condition.
A low side float valve is used to maintain: The level of the refrigerant in the evaporator
Regarding fire safety, which ASHRAE refrigerant safety A1
classification indicates no flammability and lower
toxicity?
All liquid has been recovered from a system to be Should not be opened until all vapor has been recovered
overhauled, the system
When a refrigerant engineer uses a portable The vapor density is decreasing
compressor recovery unit to remove vapor refrigerant
from a refrigeration system the removal rate of the
refrigerant will gradually slow down because
You are the engineer running a 2000-ton (steam-driven Add additional make up water to cooling tower
turbine) centrifugal refrigeration system, a refrigeration
system supplies chilled water to a college campus with
multiple buildings. During the course of making your
rounds, you check the 9 cell cooling tower on the roof.
You note the water level in all of the cooling tower cells
is very low. Which one of the following immediate
action would take?
, FDNY Z51 Practice Test
A rooftop water cooling tower is connected to a water 323
pump in the building basement with a 12 inches
diameter pipe, with the pump turn off, a pressure gauge
at the pumps inlet show a pressure of 140 PSIG the
height of the water column, in feet, would be closet to.
What device protects the steam turbine from excessive Governor assembly
speed?
A refrigeration compressor has failed to turn on. The Temperature and pressure controls
refrigeration engineer on duty verifies that the electrical
circuit to the motor, including all switches and circuit
breakers, is complete according to recommended
service practice, the next item to be checked would
likely be the:
Refrigerants are characterized by their physical Ammonia
properties included flashpoint, refrigeration effect, and
others. Of the refrigerants in commercial and industrial
the highest latent heat and refrigerant effect is:
On what characteristics is ASHRAE refrigerant safety flammability and toxicity
group classification system:
Of the following, and example of an in-line refrigerant Refrigerant recycling
cleaning system that may be used with a centrifugal
compressor containing R123 refrigerant is:
Information about the physical and chemical properties Material Safety Data Sheet
of a hazardous material can be found in:
What is the function of the turbine auxiliary oil pump? Establish oil pressure during turbine start up
The rupture disc for a low-pressure centrifugal Compressor suction
refrigeration machine is normally located on the:
What is the primary reason ribbed metal piping is used It allows for flexibility and accounts for vibrations
for electrical wires connected to the refrigeration
system shown below?
The most important reason to use at least two Avoid very high compression ratio for each compressor
compressors in a cascade system is to:
What is the function of a cylinder bypass? To allow operation at different capacities
The chilled water supply to the building is 55F. If the Yes. this temperature is too high for human comfort purpose
chiller is being used for human comfort, should you be
concerned about this, and why?
The packing gland of a centrifugal pump serves to: The drip part of the packing gland gives evidence that there is water in the
pump
Capacity control of a reciprocating hermetic Operation of the hot gas bypass valve
compressor is typically achieved through
The most important reason to sub-cool the refrigerant A pure liquid refrigerant will enter the metering device
in the condenser is to ensure that:
A refrigeration engineer is logging reading from a An expansion valve that is open to wide
reciprocating system. compressor discharge
temperature have dropped significantly and the suction
line pressure is high. which of the following that may be
causing this set of condition.
A low side float valve is used to maintain: The level of the refrigerant in the evaporator
Regarding fire safety, which ASHRAE refrigerant safety A1
classification indicates no flammability and lower
toxicity?
All liquid has been recovered from a system to be Should not be opened until all vapor has been recovered
overhauled, the system
When a refrigerant engineer uses a portable The vapor density is decreasing
compressor recovery unit to remove vapor refrigerant
from a refrigeration system the removal rate of the
refrigerant will gradually slow down because
You are the engineer running a 2000-ton (steam-driven Add additional make up water to cooling tower
turbine) centrifugal refrigeration system, a refrigeration
system supplies chilled water to a college campus with
multiple buildings. During the course of making your
rounds, you check the 9 cell cooling tower on the roof.
You note the water level in all of the cooling tower cells
is very low. Which one of the following immediate
action would take?
, FDNY Z51 Practice Test
A rooftop water cooling tower is connected to a water 323
pump in the building basement with a 12 inches
diameter pipe, with the pump turn off, a pressure gauge
at the pumps inlet show a pressure of 140 PSIG the
height of the water column, in feet, would be closet to.
What device protects the steam turbine from excessive Governor assembly
speed?
A refrigeration compressor has failed to turn on. The Temperature and pressure controls
refrigeration engineer on duty verifies that the electrical
circuit to the motor, including all switches and circuit
breakers, is complete according to recommended
service practice, the next item to be checked would
likely be the:
Refrigerants are characterized by their physical Ammonia
properties included flashpoint, refrigeration effect, and
others. Of the refrigerants in commercial and industrial
the highest latent heat and refrigerant effect is:
On what characteristics is ASHRAE refrigerant safety flammability and toxicity
group classification system:
Of the following, and example of an in-line refrigerant Refrigerant recycling
cleaning system that may be used with a centrifugal
compressor containing R123 refrigerant is:
Information about the physical and chemical properties Material Safety Data Sheet
of a hazardous material can be found in:
What is the function of the turbine auxiliary oil pump? Establish oil pressure during turbine start up
The rupture disc for a low-pressure centrifugal Compressor suction
refrigeration machine is normally located on the:
What is the primary reason ribbed metal piping is used It allows for flexibility and accounts for vibrations
for electrical wires connected to the refrigeration
system shown below?
The most important reason to use at least two Avoid very high compression ratio for each compressor
compressors in a cascade system is to:
