FDNY Z51 RMO COMPREHENSIVE QUESTIONS
AND ANSWERS
◉ 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.
Answer: difference between the high side and the low side pressure
◉ the instalation of an inline refrigerant cleaning system is
advisable.
Answer: 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:.
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
,◉ 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
◉ 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
◉ 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 cooled condenser. A
restriction in the refrigerant line would result in.
Answer: high suction super heat
◉ the process by which refrigerant is extracted and cleaned for
reuse without requirements for reclamation is called.
AND ANSWERS
◉ 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.
Answer: difference between the high side and the low side pressure
◉ the instalation of an inline refrigerant cleaning system is
advisable.
Answer: 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:.
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
,◉ 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
◉ 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
◉ 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 cooled condenser. A
restriction in the refrigerant line would result in.
Answer: high suction super heat
◉ the process by which refrigerant is extracted and cleaned for
reuse without requirements for reclamation is called.
