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Fdny Z51 Rmo Latest Version 2024/2025
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Fdny Z51 Rmo Latest Version 2024/2025
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Fdny Z51 Rmo Latest Version 2024/2025the efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the following, a
more efficient centrifugal compressor operation results from Answer: lowering the condenser
pressure
In most semi hermetic compressors, the suction vapor is used for Answer: cools the motor
The amount of refrigerant that flows through the orifices of an economizer is determined by the
Answer: difference between the high side and the low side pressure
the instalation of an inline refrigerant cleaning system is advisable 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: Answer: a faulty cooling tower water level controller
when an expansion valve is operating properly, at the end of the evaporator will contain Answer:
only superheated vapor
a centrifugal water pump is considered to be fully primed when 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: 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:
Answer: ammonia
which of the following ashrae refrigerant safety classification is the most toxic Answer: b3
which of the following ashrae refrigerant safety classification is the most flammable Answer: a3
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 Answer: r 22 (cooling medium= glycol or any brine solution)
the primary way of achieving capacity control of a an centrifugal compressor is by: Answer:
adjustment 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 Answer: keeps 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 Answer: high suction super
heat
the process by which refrigerant is extracted and cleaned for reuse without requirements for
reclamation is called Answer: recycle
the purpose of wear rings in a centrifugal pump is to Answer: prevent 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 Answer: 1.39
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