FDNY Z51 FINAL EXAM 2024 ACTUAL EXAM 2 VERSIONS COMPLETE
500 QUESTIONS WITH DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) ALREADY GRADED A+
The amount of refrigerant that flows through the
orifices of a economizer is determined by the: -
CORRECT ANSWER >>>>Difference between the
high side and load side pressure
The installation of an inline refrigerant cleaning
system is advisable: - CORRECT ANSWER >>>>To
remove impurities from the system
The type of refrigerant system that is least likely to
leak refrigerant into the building space that are
cooled - CORRECT ANSWER >>>>The indirect system
The suction pressure of a reciprocating compressor
is 65PSIG. the discharge pressure of this compressor
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is 120PSIG. the atmospheric is 14.7 PSI. the
compression ratio for the given condition is closet
to: - CORRECT ANSWER >>>>1.69
A super heated vapor is a ? - CORRECT ANSWER
>>>>Dry vapor above the saturation temperature
A refrigerant engineer verifies that a condenser
water pump is cavitating. of the following the most
likely cause for this condition is: - CORRECT
ANSWER >>>>A faulty cooling tower water level
controller
A centrifugal water pump is known as a lift pump
when the: - CORRECT ANSWER >>>>The water
supply to the pump suction inlet is below the pump
level
A TXV is used to maintain constant: - CORRECT
ANSWER >>>>Evaporator superheat
The chilled water supply to the building is 55F. if the
chiller is being used for human comfort, should you
be concerned about this , and why? - CORRECT
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ANSWER >>>>Yes, this temperature is too high for
human comfort purpose
The packing gland of a centrifugal pump serves to: -
CORRECT ANSWER >>>>The drip part of the packing
gland gives evidence that there is water in the
pump
Capacity control of a reciprocating hermetic
compressor is typically achieved through - CORRECT
ANSWER >>>>Operation of the hot gas bypass valve
The most important reason to sub-cool the
refrigerant in the condenser is to ensure that: -
CORRECT ANSWER >>>>A pure liquid refrigerant will
enter the metering device
The efficiency of the refrigerant cycle is affected by
the operation of the condenser. of the following. a
more efficient centrifugal compressor operation
results from: - CORRECT ANSWER >>>>Lowering the
condensing pressure
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The heat removed from the refrigerant in a
condenser is: - CORRECT ANSWER >>>>Sensible and
latent heat
The refrigerant unit that you have been assigned to
is being taken out of service for a major repair. you
have been assigned to withdraw refrigerant for
storage in suitable containers. according to the new
York city fire code, you must ensure that the
containers: - CORRECT ANSWER >>>>Are approved
by the US department of transportation
Which of the following best describes how the
cylinder unloader work? - CORRECT ANSWER
>>>>Keep in the suction valve opened while the
compressor is in the return stroke
In most semi hermetic compressors, the suction
vapor is used to: - CORRECT ANSWER >>>>Cool the
motor
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