fdny z51 rmo EXAM QUESTIONS WITH ANSWERS.

fdny z51 rmo EXAM QUESTIONS WITH |\ |\ |\ |\ |\ |\




ANSWERS

the efficiency of the refrigerant cycle is affected by the operation
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of the condenser. Of the following, a more efficient centrifugal
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compressor operation results from - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\


✔✔lowering the condenser pressure |\ |\ |\




In most semi hermetic compressors, the suction vapor is used for
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- CORRECT ANSWERS ✔✔cools the motor
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The amount of refrigerant that flows through the orifices of an
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economizer is determined by the - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\ |\


✔✔difference between the high side and the low side pressure |\ |\ |\ |\ |\ |\ |\ |\ |\




the instalation of an inline refrigerant cleaning system is
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advisable - CORRECT ANSWERS ✔✔to remove impurities from the
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system
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a refrigerant engineer verifies that a condenser pump is
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cavitation of the following the most likely cause for this condition
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is: - CORRECT ANSWERS ✔✔a faulty cooling tower water level
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controller


when an expansion valve is operating properly, at the end of the
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evaporator will contain - CORRECT ANSWERS ✔✔only |\ |\ |\ |\ |\ |\ |\


superheated vapor |\

,a centrifugal water pump is considered to be fully primed when -
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CORRECT ANSWERS ✔✔the pump is full of liquid |\ |\ |\ |\ |\ |\ |\




A refrigeration compressor has failed to turn on. the engineer on
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duty verifies the electrical circuit to the motor, including all
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switches and circuit breakers is complete, according to
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recomended service practice, the next item to be checked would |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


likely be the: - CORRECT ANSWERS ✔✔temperature and pressure
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controls


Refrigerants are characterized by their physical properties |\ |\ |\ |\ |\ |\ |\


including Flashpoint, refrigeration effect and others, of the
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refrigerants in commercial and industrial the highest latent heat |\ |\ |\ |\ |\ |\ |\ |\ |\


and refrigerant effect is: - CORRECT ANSWERS ✔✔ammonia
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which of the following ashrae refrigerant safety classification is
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the most toxic - CORRECT ANSWERS ✔✔b3
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which of the following ashrae refrigerant safety classification is
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the most flammable - CORRECT ANSWERS ✔✔a3
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in q indirect refrigeration system,of the following, the one that
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would not be used as a cooling medium for building spaces being
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cooled is - CORRECT ANSWERS ✔✔r 22 (cooling medium= glycol
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or any brine solution)
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, the primary way of achieving capacity control of a an centrifugal
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compressor is by: - CORRECT ANSWERS ✔✔adjustment to the
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inlet impeller pre rotation vanes
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regarding the functioning of a steam turbine, why is it advisable
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to keep moisture in the inlet low as possible - CORRECT
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ANSWERS ✔✔keeps turbine blades wear to minimum
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a water chiller is equipped with a reciprocating compressor, a
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thermostatic expansion valve and a an air cooled condenser. A
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restriction in the refrigerant line would result in - CORRECT
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ANSWERS ✔✔high suction super heat |\ |\ |\ |\




the process by which refrigerant is extracted and cleaned for
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reuse without requirements for reclamation is called - CORRECT
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ANSWERS ✔✔recycle |\




the purpose of wear rings in a centrifugal pump is to - CORRECT
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ANSWERS ✔✔prevent wearing of the pump housing and impeller
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a centrifugal compressor is in operation with suction pressure is 3
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psig and the discharge is 10psi what is the atmospheric pressure
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is 14.7 which is the ratio closest to - CORRECT ANSWERS ✔✔1.39
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electrical current us measured in - CORRECT ANSWERS
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✔✔amperage