FDNY Z51/ Z-51 REFRIGERATION EXAM TEST ACTUAL EXAM 250 QUESTIONS
AND CORRECT DETAILED ANSWERS |ALREADY GRADED A+
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
Lowering the condenser pressure
In most semi hermetic compressors, the suction vapor is used too
Cool's the motor
The amount of refrigerant that flows through the orifices of an
economizer is determined by the
Difference between the high side and the low side pressure
,the instalation of an inline refrigerant cleaning system is advisable
to remove impurities from the system
a refrigerant engineer verifies that a condenser pump is cavitating of the
following the most likely cause for this condition is:
a faulty cooling tower water level controller
when an expansion valve is operating properly, at the end of the
evaporator will contain
only superheated vapor
a centrifugal water pump is considered to be fully primed when
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:
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:
ammonia
which of the following ashrae refrigerant safety classification which is
most toxic
B3
which of the following ashrae refrigerant safety classification is the most
flammable
, A3
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 -
✔✔answers✔✔lowering the condenser pressure
In most semi hermetic compressors, the suction vapor is used for - ✔✔answers✔✔cools
the motor
The amount of refrigerant that flows through the orifices of an economizer is determined
by the - ✔✔answers✔✔difference between the high side and the low side pressure
the instalation of an inline refrigerant cleaning system is advisable - ✔✔answers✔✔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: - ✔✔answers✔✔a faulty cooling tower water level
controller
when an expansion valve is operating properly, at the end of the evaporator will contain
- ✔✔answers✔✔only superheated vapor
a centrifugal water pump is considered to be fully primed when - ✔✔answers✔✔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: - ✔✔answers✔✔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: - ✔✔answers✔✔ammonia
which of the following ashrae refrigerant safety classification is the most toxic -
✔✔answers✔✔b3
which of the following ashrae refrigerant safety classification is the most flammable -
✔✔answers✔✔a3
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