FDNY Z51 RMO - Questions With Resourceful
Solutions
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 Right Ans - lowering the
condenser pressure
In most semi hermetic compressors, the suction vapor is used for
Right Ans - cools the motor
The amount of refrigerant that flows through the orifices of an
economizer is determined by the Right Ans - difference between
the high side and the low side pressure
the instalation of an inline refrigerant cleaning system is advisable
Right Ans - 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: Right
Ans - a faulty cooling tower water level controller
when an expansion valve is operating properly, at the end of the
evaporator will contain Right Ans - only superheated vapor
,a centrifugal water pump is considered to be fully primed when
Right Ans - 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: Right
Ans - 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: Right Ans - ammonia
which of the following ashrae refrigerant safety classification is the
most toxic Right Ans - b3
which of the following ashrae refrigerant safety classification is the
most flammable Right Ans - 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 Right Ans - r 22 (cooling medium= glycol or any brine
solution)
, the primary way of achieving capacity control of a an centrifugal
compressor is by: Right Ans - 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 Right Ans - 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 Right Ans - high
suction super heat
the process by which refrigerant is extracted and cleaned for reuse
without requirements for reclamation is called Right Ans -
recycle
the purpose of wear rings in a centrifugal pump is to Right Ans -
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 Right Ans - 1.39
Solutions
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 Right Ans - lowering the
condenser pressure
In most semi hermetic compressors, the suction vapor is used for
Right Ans - cools the motor
The amount of refrigerant that flows through the orifices of an
economizer is determined by the Right Ans - difference between
the high side and the low side pressure
the instalation of an inline refrigerant cleaning system is advisable
Right Ans - 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: Right
Ans - a faulty cooling tower water level controller
when an expansion valve is operating properly, at the end of the
evaporator will contain Right Ans - only superheated vapor
,a centrifugal water pump is considered to be fully primed when
Right Ans - 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: Right
Ans - 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: Right Ans - ammonia
which of the following ashrae refrigerant safety classification is the
most toxic Right Ans - b3
which of the following ashrae refrigerant safety classification is the
most flammable Right Ans - 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 Right Ans - r 22 (cooling medium= glycol or any brine
solution)
, the primary way of achieving capacity control of a an centrifugal
compressor is by: Right Ans - 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 Right Ans - 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 Right Ans - high
suction super heat
the process by which refrigerant is extracted and cleaned for reuse
without requirements for reclamation is called Right Ans -
recycle
the purpose of wear rings in a centrifugal pump is to Right Ans -
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 Right Ans - 1.39
