FDNY written z51 questions And Complete Solutions 2024/25
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Course
FDNY Z51
Institution
FDNY Z51
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
The heat removed from the refrigerant in a condenser is: - Correct Answer ...
FDNY written z51 questions And Complete
Solutions 2024/25
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
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
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
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 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
A refrigeration engineer is logging reading from a 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. - Correct Answer An expansion valve that is open to wide
A low side float valve is used to maintain: - Correct Answer The level of the refrigerant in the evaporator
Regarding fire safety, which ASHARE refrigerant safety classification indicates no flammability and lower
the toxicity? - Correct Answer A1
, When an expansion valve is operating properly, at the end of the evaporator will contain: - Correct
Answer Only superheated vapor
What information is not contained in a material safety data sheet-MSDS? - Correct Answer Cost of
material
In a steam turbine, what is the function of the kingsbury thrust bearing - Correct Answer Maintain axial
positioning of the rotor shaft
A centrifugal water pump is considered to be fully primed when - Correct Answer The pump is full of
liquid
Copper tubing refrigerant lines must be installed for a new system. it is a well known service practice
that tubing collapses at bends that must be made, the refrigerant engineer should use - Correct Answer
Lever type tubing bender
A reciprocating compressor is making a knocking sound during operation. if the refrigerant worn parts
are not causing the knocking, what is probably the cause - Correct Answer The slugging of the liquid
refrigerant
In order for a refrigerant to become superheated in a section of the lowside refrigerant line: - Correct
Answer Where no liquid refrigerant is present
All liquid has been recovered from a system to be overhauled, the system - Correct Answer Should not
be opened until all vapor has been removed
When a refrigerant engineer uses a portable compressor recovery unit to remove vapor refrigerant from
a refrigeration system the removal rate of the refrigerant will gradually slow down because - Correct
Answer The vapor density is decreasing
You are the engineer running a 2000-ton (steam-driven 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
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