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FDNY Z51 RMO Questions and Answers
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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 - correct
answer lowering the condenser pressure
In most semi hermetic compressors, the suction vapor is used for - correct answer cools
the motor
The amount of refrigerant that flows through the orifices of an economizer is determined
by the - correct answer difference between the high side and the low side pressure
the instalation of an inline refrigerant cleaning system is advisable - correct answer to
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: - correct answer a faulty cooling tower water level
controller
when an expansion valve is operating properly, at the end of the evaporator will contain
- correct answer only superheated vapor
a centrifugal water pump is considered to be fully primed when - correct answer the
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: - correct answer temperature 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: - correct answer ammonia
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