FDNY Z51 RMO EXAM REVISION QUESTIONS AND CORRECT
ANSWERS 2024/2-25.
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 - 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
ANSWERS 2024/2-25.
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 - 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
