FDNY Z51 RMO PRACTICE REVIEW 2026
ACTUAL ANSWERS VERIFIED GRADED A+
⩥ The heat removed from the refrigerant in a condenser is: 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: Answer: Are
approved by the US department of transportation
⩥ Which of the following best describes how the cylinder unloader
work? 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:
Answer: Cool the motor
⩥ The amount of refrigerant that flows through the orifices of a
economizer is determined by the: Answer: Difference between the high
side and load side pressure
,⩥ The installation of an inline refrigerant cleaning system is advisable:
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 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:
Answer: 1.69
⩥ A super heated vapor is a ? 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:
Answer: A faulty cooling tower water level controller
⩥ A centrifugal water pump is known as a lift pump when the: Answer:
The water supply to the pump suction inlet is below the pump level
⩥ A TXV is used to maintain constant: 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?
Answer: Yes, this temperature is too high for human comfort purpose
⩥ The packing gland of a centrifugal pump serves to: 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 Answer: Operation of the hot gas bypass valve
⩥ The most important reason to sub-cool the refrigerant in the condenser
is to ensure that: 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. Answer: An expansion valve that is open to
wide
⩥ A low side float valve is used to maintain: Answer: The level of the
refrigerant in the evaporator
⩥ Regarding fire safety, which ASHARE refrigerant safety classification
indicates no flammability and lower the toxicity? Answer: A1
, ⩥ When an expansion valve is operating properly, at the end of the
evaporator will contain: Answer: Only superheated vapor
⩥ What information is not contained in a material safety data sheet-
MSDS? Answer: Cost of material
⩥ In a steam turbine, what is the function of the kingsbury thrust bearing
Answer: Maintain axial positioning of the rotor shaft
⩥ A centrifugal water pump is considered to be fully primed when
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 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 Answer: The slugging of the liquid
refrigerant
⩥ In order for a refrigerant to become superheated in a section of the
lowside refrigerant line: Answer: Where no liquid refrigerant is present
ACTUAL ANSWERS VERIFIED GRADED A+
⩥ The heat removed from the refrigerant in a condenser is: 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: Answer: Are
approved by the US department of transportation
⩥ Which of the following best describes how the cylinder unloader
work? 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:
Answer: Cool the motor
⩥ The amount of refrigerant that flows through the orifices of a
economizer is determined by the: Answer: Difference between the high
side and load side pressure
,⩥ The installation of an inline refrigerant cleaning system is advisable:
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 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:
Answer: 1.69
⩥ A super heated vapor is a ? 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:
Answer: A faulty cooling tower water level controller
⩥ A centrifugal water pump is known as a lift pump when the: Answer:
The water supply to the pump suction inlet is below the pump level
⩥ A TXV is used to maintain constant: 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?
Answer: Yes, this temperature is too high for human comfort purpose
⩥ The packing gland of a centrifugal pump serves to: 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 Answer: Operation of the hot gas bypass valve
⩥ The most important reason to sub-cool the refrigerant in the condenser
is to ensure that: 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. Answer: An expansion valve that is open to
wide
⩥ A low side float valve is used to maintain: Answer: The level of the
refrigerant in the evaporator
⩥ Regarding fire safety, which ASHARE refrigerant safety classification
indicates no flammability and lower the toxicity? Answer: A1
, ⩥ When an expansion valve is operating properly, at the end of the
evaporator will contain: Answer: Only superheated vapor
⩥ What information is not contained in a material safety data sheet-
MSDS? Answer: Cost of material
⩥ In a steam turbine, what is the function of the kingsbury thrust bearing
Answer: Maintain axial positioning of the rotor shaft
⩥ A centrifugal water pump is considered to be fully primed when
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 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 Answer: The slugging of the liquid
refrigerant
⩥ In order for a refrigerant to become superheated in a section of the
lowside refrigerant line: Answer: Where no liquid refrigerant is present
