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