[Date] FDNY Z51 RMO EXAM
, FDNY Z51 RMO Actual Exam Questions
with 100% Correct Answers | 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 for - ✔✔cools 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 cavitation of the
following the most likely cause for this condition is: - ✔✔a faulty cooling tower
water level controller
1|Page
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
, 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 is the most toxic -
✔✔b3
which of the following ashrae refrigerant safety classification is the most
flammable - ✔✔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 - ✔✔r 22 (cooling
medium= glycol or any brine solution)
2|Page
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
, FDNY Z51 RMO Actual Exam Questions
with 100% Correct Answers | 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 for - ✔✔cools 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 cavitation of the
following the most likely cause for this condition is: - ✔✔a faulty cooling tower
water level controller
1|Page
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
, 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 is the most toxic -
✔✔b3
which of the following ashrae refrigerant safety classification is the most
flammable - ✔✔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 - ✔✔r 22 (cooling
medium= glycol or any brine solution)
2|Page
©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025.
