1|Page
FDNY Z-51 EXAM LATEST 2026-2027 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
In a building with a multi zone How does each zone get supplied
with water - ANSWER-Each zone will have its own automatic
water supply
Which service valve should be Install to isolate dual pressure
relief valve while keeping the system in service - ANSWER-3 way
valve
How many BTU's are removed in a 30 ton system - ANSWER-
360000 BTU's per hour
An automatic expansion valve maintains a constant - ANSWER-
Evaporator pressure
If the air lovers below the fans in an induced draft cooling tower
become clogged the result would be - ANSWER-Higher return
water temperature
,2|Page
You have a cold front and there is a sudden drop in temperature
the thermostat will cause the solenoid valve - ANSWER-Close
and pump the compress it down and shut down on low pressure
What happens when a steam turbine reaches critical speed -
ANSWER-Turbine will vibrate violently
What Device automatically controls the speed of a steam turbine -
ANSWER-Governor valve
Under what circumstances is it OK to chain and exit - ANSWER-It
is never OK
The heat remove from the refrigerator in the condenser is -
ANSWER-Sensible and latent heat
There a fridge or in unit that you have been assigned to is being
taken out of service for major repair you have been assigned to
withdraw a refrigerant for storage and suitable containers
, 3|Page
according to New York City fire code you must ensure the
containers - ANSWER-Are approved by the US Department of
Transportation
Which of the following best describes house cylinder unloaders
work - ANSWER-Keep in the suction valve opened wall
compressor is in the return stroke
In most semi hermetic compressors the suction valve is used to -
ANSWER-Cool the motor
The amount of refrigerant that flows through the orifices of an
economizer is Determined by the - ANSWER-Difference between
the high side in low side pressure
The installation of an inline refrigerate cleaning system is
Adviseable - ANSWER-To remove impurities from the system
FDNY Z-51 EXAM LATEST 2026-2027 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
In a building with a multi zone How does each zone get supplied
with water - ANSWER-Each zone will have its own automatic
water supply
Which service valve should be Install to isolate dual pressure
relief valve while keeping the system in service - ANSWER-3 way
valve
How many BTU's are removed in a 30 ton system - ANSWER-
360000 BTU's per hour
An automatic expansion valve maintains a constant - ANSWER-
Evaporator pressure
If the air lovers below the fans in an induced draft cooling tower
become clogged the result would be - ANSWER-Higher return
water temperature
,2|Page
You have a cold front and there is a sudden drop in temperature
the thermostat will cause the solenoid valve - ANSWER-Close
and pump the compress it down and shut down on low pressure
What happens when a steam turbine reaches critical speed -
ANSWER-Turbine will vibrate violently
What Device automatically controls the speed of a steam turbine -
ANSWER-Governor valve
Under what circumstances is it OK to chain and exit - ANSWER-It
is never OK
The heat remove from the refrigerator in the condenser is -
ANSWER-Sensible and latent heat
There a fridge or in unit that you have been assigned to is being
taken out of service for major repair you have been assigned to
withdraw a refrigerant for storage and suitable containers
, 3|Page
according to New York City fire code you must ensure the
containers - ANSWER-Are approved by the US Department of
Transportation
Which of the following best describes house cylinder unloaders
work - ANSWER-Keep in the suction valve opened wall
compressor is in the return stroke
In most semi hermetic compressors the suction valve is used to -
ANSWER-Cool the motor
The amount of refrigerant that flows through the orifices of an
economizer is Determined by the - ANSWER-Difference between
the high side in low side pressure
The installation of an inline refrigerate cleaning system is
Adviseable - ANSWER-To remove impurities from the system
