Fdny Z51 Rmo 2025/2026 Exam
Questions and Verified Answers |
Already 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 - 🧠ANSWER ✔✔lowering the condenser pressure
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
1
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
,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
2
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, 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
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
Questions and Verified Answers |
Already 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 - 🧠ANSWER ✔✔lowering the condenser pressure
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
1
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
,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
2
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, 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
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
