1|Page
FDNY Z-51 EXAM LATEST 2025/2026 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
Which of the following will connect to the Middle port on a gauge
manifold - ANSWER-Vacuum pump
There is a decrease in efficiency of a reciprocating compressor.
The most likely is caused by - ANSWER-Leaking suction valve
The suction and discharge valve of the reciprocating compressor
are mounted as follows - ANSWER-Discharge valve on top of the
valve plate and suction valve below
A high side float is used to maintain - ANSWER-Constant level of
refrigerant in the evaporator
Which of these compressors is not a positive type compressor
displacement - ANSWER-Centrifugal
,2|Page
When is emergency power not required according to code -
ANSWER-Data centers
What is the most widely used regulation book by operating
engineers - ANSWER-EPA
What type of refrigerant do you need FDNY approval for -
ANSWER-Propane
Centrifugal pressure is determined by - ANSWER-Speed of motor
Liquid refrigerant that has passed through a metering device is at
- ANSWER-Low pressure saturated liquid
What is the advantage of a shell and tube condenser as oposed
to a shell and coil condenser - ANSWER-Better heat transfer
Where is the muffler located - ANSWER-Between the compressor
and condenser
, 3|Page
After recovering liquid refrigerant from a centrifugal chiller the next
step shall be - ANSWER-Recover vapor
How long must a fire alarm log book be kept - ANSWER-3 years
What is the minimum requirement of an engineer needs to log
readings - ANSWER-Once per shift
When entering phase 2 firemen service what statement is correct
- ANSWER-The elevator operator is the only person that can
control the elevator
You are the only engineer on duty with the machine running a vice
president tells you to shovel snow what should you do -
ANSWER-Do not leave the building
How often must you do emergency power testing - ANSWER-
Monthly
FDNY Z-51 EXAM LATEST 2025/2026 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
Which of the following will connect to the Middle port on a gauge
manifold - ANSWER-Vacuum pump
There is a decrease in efficiency of a reciprocating compressor.
The most likely is caused by - ANSWER-Leaking suction valve
The suction and discharge valve of the reciprocating compressor
are mounted as follows - ANSWER-Discharge valve on top of the
valve plate and suction valve below
A high side float is used to maintain - ANSWER-Constant level of
refrigerant in the evaporator
Which of these compressors is not a positive type compressor
displacement - ANSWER-Centrifugal
,2|Page
When is emergency power not required according to code -
ANSWER-Data centers
What is the most widely used regulation book by operating
engineers - ANSWER-EPA
What type of refrigerant do you need FDNY approval for -
ANSWER-Propane
Centrifugal pressure is determined by - ANSWER-Speed of motor
Liquid refrigerant that has passed through a metering device is at
- ANSWER-Low pressure saturated liquid
What is the advantage of a shell and tube condenser as oposed
to a shell and coil condenser - ANSWER-Better heat transfer
Where is the muffler located - ANSWER-Between the compressor
and condenser
, 3|Page
After recovering liquid refrigerant from a centrifugal chiller the next
step shall be - ANSWER-Recover vapor
How long must a fire alarm log book be kept - ANSWER-3 years
What is the minimum requirement of an engineer needs to log
readings - ANSWER-Once per shift
When entering phase 2 firemen service what statement is correct
- ANSWER-The elevator operator is the only person that can
control the elevator
You are the only engineer on duty with the machine running a vice
president tells you to shovel snow what should you do -
ANSWER-Do not leave the building
How often must you do emergency power testing - ANSWER-
Monthly
