fdny z51 rmo EXAM QUESTIONS WITH |\ |\ |\ |\ |\ |\
ANSWERS
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 ANSWERS |\ |\ |\ |\ |\ |\ |\
✔✔lowering the condenser pressure |\ |\ |\
In most semi hermetic compressors, the suction vapor is used for
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔cools the motor
|\ |\ |\ |\ |\ |\
The amount of refrigerant that flows through the orifices of an
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
economizer is determined by the - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\ |\
✔✔difference between the high side and the low side pressure |\ |\ |\ |\ |\ |\ |\ |\ |\
the instalation of an inline refrigerant cleaning system is
|\ |\ |\ |\ |\ |\ |\ |\ |\
advisable - CORRECT 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: - CORRECT ANSWERS ✔✔a faulty cooling tower water level
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
controller
when an expansion valve is operating properly, at the end of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
evaporator will contain - CORRECT ANSWERS ✔✔only |\ |\ |\ |\ |\ |\ |\
superheated vapor |\
,a centrifugal water pump is considered to be fully primed when -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT 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: - CORRECT 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: - CORRECT ANSWERS ✔✔ammonia
|\ |\ |\ |\ |\ |\ |\
which of the following ashrae refrigerant safety classification is
|\ |\ |\ |\ |\ |\ |\ |\ |\
the most toxic - CORRECT ANSWERS ✔✔b3
|\ |\ |\ |\ |\ |\
which of the following ashrae refrigerant safety classification is
|\ |\ |\ |\ |\ |\ |\ |\ |\
the most flammable - CORRECT ANSWERS ✔✔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 ANSWERS ✔✔r 22 (cooling medium= glycol
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
or any brine solution)
|\ |\ |\
, the primary way of achieving capacity control of a an centrifugal
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
compressor is by: - CORRECT ANSWERS ✔✔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
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔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
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔high suction super heat |\ |\ |\ |\
the process by which refrigerant is extracted and cleaned for
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
reuse without requirements for reclamation is called - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔recycle |\
the purpose of wear rings in a centrifugal pump is to - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔prevent wearing of the pump housing and impeller
|\ |\ |\ |\ |\ |\ |\ |\
a centrifugal compressor is in operation with suction pressure is 3
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
psig and the discharge is 10psi what is the atmospheric pressure
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
is 14.7 which is the ratio closest to - CORRECT ANSWERS ✔✔1.39
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
electrical current us measured in - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔amperage
ANSWERS
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 ANSWERS |\ |\ |\ |\ |\ |\ |\
✔✔lowering the condenser pressure |\ |\ |\
In most semi hermetic compressors, the suction vapor is used for
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔cools the motor
|\ |\ |\ |\ |\ |\
The amount of refrigerant that flows through the orifices of an
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
economizer is determined by the - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\ |\
✔✔difference between the high side and the low side pressure |\ |\ |\ |\ |\ |\ |\ |\ |\
the instalation of an inline refrigerant cleaning system is
|\ |\ |\ |\ |\ |\ |\ |\ |\
advisable - CORRECT 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: - CORRECT ANSWERS ✔✔a faulty cooling tower water level
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
controller
when an expansion valve is operating properly, at the end of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
evaporator will contain - CORRECT ANSWERS ✔✔only |\ |\ |\ |\ |\ |\ |\
superheated vapor |\
,a centrifugal water pump is considered to be fully primed when -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT 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: - CORRECT 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: - CORRECT ANSWERS ✔✔ammonia
|\ |\ |\ |\ |\ |\ |\
which of the following ashrae refrigerant safety classification is
|\ |\ |\ |\ |\ |\ |\ |\ |\
the most toxic - CORRECT ANSWERS ✔✔b3
|\ |\ |\ |\ |\ |\
which of the following ashrae refrigerant safety classification is
|\ |\ |\ |\ |\ |\ |\ |\ |\
the most flammable - CORRECT ANSWERS ✔✔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 ANSWERS ✔✔r 22 (cooling medium= glycol
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
or any brine solution)
|\ |\ |\
, the primary way of achieving capacity control of a an centrifugal
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
compressor is by: - CORRECT ANSWERS ✔✔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
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔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
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔high suction super heat |\ |\ |\ |\
the process by which refrigerant is extracted and cleaned for
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
reuse without requirements for reclamation is called - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔recycle |\
the purpose of wear rings in a centrifugal pump is to - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔prevent wearing of the pump housing and impeller
|\ |\ |\ |\ |\ |\ |\ |\
a centrifugal compressor is in operation with suction pressure is 3
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
psig and the discharge is 10psi what is the atmospheric pressure
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
is 14.7 which is the ratio closest to - CORRECT ANSWERS ✔✔1.39
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
electrical current us measured in - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔amperage
