1|Page
FDNY Z51 REFRIGERATION EXAM LATEST 2024
WITH ACTUAL QUESTIONS AND CORRECT
VERIFIED ANSWERS/ALREADY GRADED A+
100% GUARANTEED TO PASS CONCEPTS(ALL
WHAT YOU NEED) LATEST EDITION 2024
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 - side
pressure.....ANSWER ...✔✔ difference between the
high side and the low
the instalation of an inline refrigerant cleaning system is
advisable - .....ANSWER ...✔✔ to remove impurities
from the system
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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
, 3|Page
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
FDNY Z51 REFRIGERATION EXAM LATEST 2024
WITH ACTUAL QUESTIONS AND CORRECT
VERIFIED ANSWERS/ALREADY GRADED A+
100% GUARANTEED TO PASS CONCEPTS(ALL
WHAT YOU NEED) LATEST EDITION 2024
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 - side
pressure.....ANSWER ...✔✔ difference between the
high side and the low
the instalation of an inline refrigerant cleaning system is
advisable - .....ANSWER ...✔✔ to remove impurities
from the system
,2|Page
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
, 3|Page
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
