FDNY Z51 RMO UPDATED Exam Questions and CORRECT Answers
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FDNY Z51 RMO
Institution
FDNY Z51 RMO
FDNY Z51 RMO UPDATED Exam
Questions and CORRECT Answers
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 Answerlowering the condenser pressure
In most semi hermeti...
FDNY Z51 RMO UPDATED Exam
Questions and CORRECT Answers
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
, which of the following ashrae refrigerant safety classification is the most toxic - Correct
Answer- b3
which of the following ashrae refrigerant safety classification is the most flammable - Correct
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 - Correct Answer- r 22 (cooling medium= glycol
or any brine solution)
the primary way of achieving capacity control of a an centrifugal compressor is by: - Correct
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 - Correct 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 - Correct
Answer- high suction super heat
the process by which refrigerant is extracted and cleaned for reuse without requirements for
reclamation is called - Correct Answer- recycle
the purpose of wear rings in a centrifugal pump is to - Correct 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 - Correct Answer-
1.39
electrical current us measured in - Correct Answer- amperage
how would you put an additional pump online - Correct Answer- open suction valve, open
discharge valve gradually
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