FDNY Z51 FINAL EXAM 2024 ACTUAL EXAM 2
VERSIONS COMPLETE 500 QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) / ALREADY GRADED A+
the efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the
o o o o o o o o o o o o o o o
following, a more efficient centrifugal compressor operation results from - ANS-lowering the
o o o o o o o o o o o o
condenser pressure
o o
In most semi hermetic compressors, the suction vapor is used for - ANS-cools the motor
o o o o o o o o o o o o o o
The amount of refrigerant that flows through the orifices of an economizer is determined by the -
o o o o o o o o o o o o o o o o
ANS-difference between the high side and the low side pressure
o o o o o o o o o o
the instalation of an inline refrigerant cleaning system is advisable - ANS-to remove impurities
o o o o o o o o o o o o o
from the system
o o o
,a refrigerant engineer verifies that a condenser pump is cavitation of the following the most
o o o o o o o o o o o o o o
likely cause for this condition is: - ANS-a faulty cooling tower water level controller
o o o o o o o o o o o o o o
when an expansion valve is operating properly, at the end of the evaporator will contain - ANS-
o o o o o o o o o o o o o o o o
only superheated vapor
o o
a centrifugal water pump is considered to be fully primed when - ANS-the pump is full of liquid
o o o o o o o o o o o o o o o o o
A refrigeration compressor has failed to turn on. the engineer on duty verifies the electrical
o o o o o o o o o o o o o o
circuit to the motor, including all switches and circuit breakers is complete, according to
o o o o o o o o o o o o o o
recomended service practice, the next item to be checked would likely be the: - ANS-
o o o o o o o o o o o o o o o
temperature and pressure controls o o o
Refrigerants are characterized by their physical properties including Flashpoint, refrigeration
o o o o o o o o o
effect and others, of the refrigerants in commercial and industrial the highest latent heat and
o o o o o o o o o o o o o o o
refrigerant effect is: - ANS-ammonia
o o o o o
which of the following ashrae refrigerant safety classification is the most toxic - ANS-b3
o o o o o o o o o o o o o
which of the following ashrae refrigerant safety classification is the most flammable - ANS-a3
o o o o o o o o o o o o o
, in q indirect refrigeration system,of the following, the one that would not be used as a cooling
o o o o o o o o o o o o o o o o
medium for building spaces being cooled is - ANS-r 22 (cooling medium= glycol or any brine
o o o o o o o o o o o o o o o o
solution)
o
the primary way of achieving capacity control of a an centrifugal compressor is by: - ANS-
o o o o o o o o o o o o o o o
adjustment to the inlet impeller pre rotation vanes o o o o o o o
regarding the functioning of a steam turbine, why is it advisable to keep moisture in the inlet low
o o o o o o o o o o o o o o o o o
as possible - ANS-keeps turbine blades wear to minimum
o o o o o o o o o
a water chiller is equipped with a reciprocating compressor, a thermostatic expansion valve and
o o o o o o o o o o o o o
a an air cooled condenser. A restriction in the refrigerant line would result in - ANS-high suction
o o o o o o o o o o o o o o o o o
super heat
o o
the process by which refrigerant is extracted and cleaned for reuse without requirements for
o o o o o o o o o o o o o
reclamation is called - ANS-recycle
o o o o o
the purpose of wear rings in a centrifugal pump is to - ANS-prevent wearing of the pump housing
o o o o o o o o o o o o o o o o o
and impeller
o o
a centrifugal compressor is in operation with suction pressure is 3 psig and the discharge is 10psi
o o o o o o o o o o o o o o o o
what is the atmospheric pressure is 14.7 which is the ratio closest to - ANS-1.39
o o o o o o o o o o o o o o o
VERSIONS COMPLETE 500 QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) / ALREADY GRADED A+
the efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the
o o o o o o o o o o o o o o o
following, a more efficient centrifugal compressor operation results from - ANS-lowering the
o o o o o o o o o o o o
condenser pressure
o o
In most semi hermetic compressors, the suction vapor is used for - ANS-cools the motor
o o o o o o o o o o o o o o
The amount of refrigerant that flows through the orifices of an economizer is determined by the -
o o o o o o o o o o o o o o o o
ANS-difference between the high side and the low side pressure
o o o o o o o o o o
the instalation of an inline refrigerant cleaning system is advisable - ANS-to remove impurities
o o o o o o o o o o o o o
from the system
o o o
,a refrigerant engineer verifies that a condenser pump is cavitation of the following the most
o o o o o o o o o o o o o o
likely cause for this condition is: - ANS-a faulty cooling tower water level controller
o o o o o o o o o o o o o o
when an expansion valve is operating properly, at the end of the evaporator will contain - ANS-
o o o o o o o o o o o o o o o o
only superheated vapor
o o
a centrifugal water pump is considered to be fully primed when - ANS-the pump is full of liquid
o o o o o o o o o o o o o o o o o
A refrigeration compressor has failed to turn on. the engineer on duty verifies the electrical
o o o o o o o o o o o o o o
circuit to the motor, including all switches and circuit breakers is complete, according to
o o o o o o o o o o o o o o
recomended service practice, the next item to be checked would likely be the: - ANS-
o o o o o o o o o o o o o o o
temperature and pressure controls o o o
Refrigerants are characterized by their physical properties including Flashpoint, refrigeration
o o o o o o o o o
effect and others, of the refrigerants in commercial and industrial the highest latent heat and
o o o o o o o o o o o o o o o
refrigerant effect is: - ANS-ammonia
o o o o o
which of the following ashrae refrigerant safety classification is the most toxic - ANS-b3
o o o o o o o o o o o o o
which of the following ashrae refrigerant safety classification is the most flammable - ANS-a3
o o o o o o o o o o o o o
, in q indirect refrigeration system,of the following, the one that would not be used as a cooling
o o o o o o o o o o o o o o o o
medium for building spaces being cooled is - ANS-r 22 (cooling medium= glycol or any brine
o o o o o o o o o o o o o o o o
solution)
o
the primary way of achieving capacity control of a an centrifugal compressor is by: - ANS-
o o o o o o o o o o o o o o o
adjustment to the inlet impeller pre rotation vanes o o o o o o o
regarding the functioning of a steam turbine, why is it advisable to keep moisture in the inlet low
o o o o o o o o o o o o o o o o o
as possible - ANS-keeps turbine blades wear to minimum
o o o o o o o o o
a water chiller is equipped with a reciprocating compressor, a thermostatic expansion valve and
o o o o o o o o o o o o o
a an air cooled condenser. A restriction in the refrigerant line would result in - ANS-high suction
o o o o o o o o o o o o o o o o o
super heat
o o
the process by which refrigerant is extracted and cleaned for reuse without requirements for
o o o o o o o o o o o o o
reclamation is called - ANS-recycle
o o o o o
the purpose of wear rings in a centrifugal pump is to - ANS-prevent wearing of the pump housing
o o o o o o o o o o o o o o o o o
and impeller
o o
a centrifugal compressor is in operation with suction pressure is 3 psig and the discharge is 10psi
o o o o o o o o o o o o o o o o
what is the atmospheric pressure is 14.7 which is the ratio closest to - ANS-1.39
o o o o o o o o o o o o o o o
