fdny z51 rmo questions answered 2023 verified
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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 -
Answerlowering the condenser pressure
/.In most semi hermetic compressors, the suction vapor is used for - Answercools the
motor
/.The amount of refrigerant that flows through the orifices of an economizer is
determined by the - Answerdifference between the high side and the low side pressure
/.the instalation of an inline refrigerant cleaning system is advisable - Answerto remove
impurities from the system
/.a refrigerant engineer verifies that a condenser pump is cavitation of the following the
most likely cause for this condition is: - Answera faulty cooling tower water level
controller
/.when an expansion valve is operating properly, at the end of the evaporator will
contain - Answeronly superheated vapor
/.a centrifugal water pump is considered to be fully primed when - Answerthe pump is
full of liquid
/.A refrigeration compressor has failed to turn on. the engineer on duty verifies the
electrical circuit to the motor, including all switches and circuit breakers is complete,
according to recomended service practice, the next item to be checked would likely be
the: - Answertemperature and pressure controls
/.Refrigerants are characterized by their physical properties including Flashpoint,
refrigeration effect and others, of the refrigerants in commercial and industrial the
highest latent heat and refrigerant effect is: - Answerammonia
/.which of the following ashrae refrigerant safety classification is the most toxic -
Answerb3
/.which of the following ashrae refrigerant safety classification is the most flammable -
Answera3
/.in q indirect refrigeration system,of the following, the one that would not be used as a
cooling medium for building spaces being cooled is - Answerr 22 (cooling medium=
glycol or any brine solution)
, /.the primary way of achieving capacity control of a an centrifugal compressor is by: -
Answeradjustment to the inlet impeller pre rotation vanes
/.regarding the functioning of a steam turbine, why is it advisable to keep moisture in the
inlet low as possible - Answerkeeps turbine blades wear to minimum
/.a water chiller is equipped with a reciprocating compressor, a thermostatic expansion
valve and a an air cooled condenser. A restriction in the refrigerant line would result in -
Answerhigh suction super heat
/.the process by which refrigerant is extracted and cleaned for reuse without
requirements for reclamation is called - Answerrecycle
/.the purpose of wear rings in a centrifugal pump is to - Answerprevent wearing of the
pump housing and impeller
/.a centrifugal compressor is in operation with suction pressure is 3 psig and the
discharge is 10psi what is the atmospheric pressure is 14.7 which is the ratio closest to
- Answer1.39
/.electrical current us measured in - Answeramperage
/.how would you put an additional pump online - Answeropen suction valve, open
discharge valve gradually
/.of the following, the major advantage of a shell and coil condenser is - Answerthere is
less danger of developing leaks
/.an engineer needs to vary the flow of refrigerant in a refrigeration system, which
operation in the flow of the system does not include - Answersolenoid valve
/.thermal bull is attached to the suction plate between the evaporator cokl and the
compressor by an insulated line. assume that the machine room is 85deg f . break down
of the insulation results in: - Answerflood the evaporator
/.water and moisture is serious problem in a refrigerant system how to avoid -
Answerproper evaluation at the charging of the system
/.while on duty a refrigeration engineer notic That the suction line to the compressor and
part of the compressor itself is frosted over the following the most likely reason for this
condition would be - AnswerThere is not enough Refrigerant in the system
/.While doing a routine inspection the engineer notices the bulb of the TXV on the floor.
The refrigerant engineer should have attached a bulb at the - AnswerThe outlet end of
the coil
graded A+ already passed!
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 -
Answerlowering the condenser pressure
/.In most semi hermetic compressors, the suction vapor is used for - Answercools the
motor
/.The amount of refrigerant that flows through the orifices of an economizer is
determined by the - Answerdifference between the high side and the low side pressure
/.the instalation of an inline refrigerant cleaning system is advisable - Answerto remove
impurities from the system
/.a refrigerant engineer verifies that a condenser pump is cavitation of the following the
most likely cause for this condition is: - Answera faulty cooling tower water level
controller
/.when an expansion valve is operating properly, at the end of the evaporator will
contain - Answeronly superheated vapor
/.a centrifugal water pump is considered to be fully primed when - Answerthe pump is
full of liquid
/.A refrigeration compressor has failed to turn on. the engineer on duty verifies the
electrical circuit to the motor, including all switches and circuit breakers is complete,
according to recomended service practice, the next item to be checked would likely be
the: - Answertemperature and pressure controls
/.Refrigerants are characterized by their physical properties including Flashpoint,
refrigeration effect and others, of the refrigerants in commercial and industrial the
highest latent heat and refrigerant effect is: - Answerammonia
/.which of the following ashrae refrigerant safety classification is the most toxic -
Answerb3
/.which of the following ashrae refrigerant safety classification is the most flammable -
Answera3
/.in q indirect refrigeration system,of the following, the one that would not be used as a
cooling medium for building spaces being cooled is - Answerr 22 (cooling medium=
glycol or any brine solution)
, /.the primary way of achieving capacity control of a an centrifugal compressor is by: -
Answeradjustment to the inlet impeller pre rotation vanes
/.regarding the functioning of a steam turbine, why is it advisable to keep moisture in the
inlet low as possible - Answerkeeps turbine blades wear to minimum
/.a water chiller is equipped with a reciprocating compressor, a thermostatic expansion
valve and a an air cooled condenser. A restriction in the refrigerant line would result in -
Answerhigh suction super heat
/.the process by which refrigerant is extracted and cleaned for reuse without
requirements for reclamation is called - Answerrecycle
/.the purpose of wear rings in a centrifugal pump is to - Answerprevent wearing of the
pump housing and impeller
/.a centrifugal compressor is in operation with suction pressure is 3 psig and the
discharge is 10psi what is the atmospheric pressure is 14.7 which is the ratio closest to
- Answer1.39
/.electrical current us measured in - Answeramperage
/.how would you put an additional pump online - Answeropen suction valve, open
discharge valve gradually
/.of the following, the major advantage of a shell and coil condenser is - Answerthere is
less danger of developing leaks
/.an engineer needs to vary the flow of refrigerant in a refrigeration system, which
operation in the flow of the system does not include - Answersolenoid valve
/.thermal bull is attached to the suction plate between the evaporator cokl and the
compressor by an insulated line. assume that the machine room is 85deg f . break down
of the insulation results in: - Answerflood the evaporator
/.water and moisture is serious problem in a refrigerant system how to avoid -
Answerproper evaluation at the charging of the system
/.while on duty a refrigeration engineer notic That the suction line to the compressor and
part of the compressor itself is frosted over the following the most likely reason for this
condition would be - AnswerThere is not enough Refrigerant in the system
/.While doing a routine inspection the engineer notices the bulb of the TXV on the floor.
The refrigerant engineer should have attached a bulb at the - AnswerThe outlet end of
the coil
