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FDNY Z51 Test Questions and Answers 2025
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FDNY Z51 Test Questions and Answers 2025
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FDNY Z51 Test Questions and Answers 2025FDNY Z51 EXAM 2024
A refrigerant engineer verifies that a chilled water pump is
cavity to of the following the most likely cause for this
condition is - ...ANSWER...Water leaks through the
mechanical seals
The only refrigerant/temperature chart available to a
refrigeration engineer lists the temperature In ﾟC if the chart
indicates a Celsius temperature of 4ﾟ this is equivalent to -
...ANSWER ...39.2ﾟ
The use of oil in the refrigeration machine is to -
...ANSWER...Reduce wear and friction in the compressor
parts
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
1
,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
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
2
,Where is the muffler located - ...ANSWER...Between the
compressor and condenser
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
What is the responsibility of AB29 certificate of fitness
holder - ...ANSWER...Inspect the battery system
An engineer observes a gauge to read saturation pressure of
refrigerant if chilled water circulated as the cooling medium
this reading best be used to estimate the -
...ANSWER...Temperature of the chilled water being
pumped to the spaces being cooled
3
, Regardless of the ASHRAE refrigeration classification in
use in the event of a refrigerant escape the engineer should
be aware of - ...ANSWER...asphyxiation
When is a chemical fire extinguisher and system needed -
...ANSWER...Where water is not sufficient
What type of refrigerants found inside the machines gages -
...ANSWER...Same type as the refrigerant inside the
machine
Fireproof decorations in buildings are used for -
...ANSWER...They don't catch fire in an emergency
Water regulating valves are used for -
...ANSWER...Maintain condenser pressure To a pre
determined level
How long does it take to warm up a steam turbine -
...ANSWER...10 to 15 minutes
Why is a pressure relief out better than a fusible plugs -
...ANSWER...Minimize refrigerant los
You are performing hot work near a sprinkler head what can
you do to prevent the fire alarm system from going off -
...ANSWER...Put a non combustible barrier to protect the
sprinkler
What type of sprinkler heads need inspecting -
...ANSWER...Automatic
4
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