FDNY Z51 RMO| QUESTIONS AND 100% VERIFIRD ANSWERS|
LATEST EXAM UPDATE 2025/2026
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
LATEST EXAM UPDATE 2025/2026
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
