FDNY Z51 RMO ACTUAL EXAMINATION
2026 QUESTIONS WITH ANSWERS GRADED
A+
⩥ 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
⩥ 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. Answer: recycle
⩥ the purpose of wear rings in a centrifugal pump is to. Answer: 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. Answer: 1.39
⩥ electrical current us measured in. Answer: amperage
⩥ how would you put an additional pump online. Answer: open suction
valve, open discharge valve gradually
⩥ of the following, the major advantage of a shell and coil condenser is.
Answer: there is less danger of developing leaks
2026 QUESTIONS WITH ANSWERS GRADED
A+
⩥ 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
⩥ 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. Answer: recycle
⩥ the purpose of wear rings in a centrifugal pump is to. Answer: 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. Answer: 1.39
⩥ electrical current us measured in. Answer: amperage
⩥ how would you put an additional pump online. Answer: open suction
valve, open discharge valve gradually
⩥ of the following, the major advantage of a shell and coil condenser is.
Answer: there is less danger of developing leaks
