FDNY Z51 TEST EXAM ,Z51 WRITTEN T n n n n n n
EST TAURIS AND A STUDY GUIDE EXA
n n n n n n
M 2024 VERSION 400 QUESTIONS WITH
n n n n n n
DETAILED VERIFIED ANSWERS AND R n n n n
ATIONALES /A+ GRADE n n
ASSURED
FDNY Z51 EXAM 2024 n n n
A refrigerant engineer verifies that a chilled water pump is cavit
n n n n n n n n n n
y to of the following the most likely cause for this condition is -
n n n n n n n n n n n n n
...ANSWER...Water leaks through the mechanical seals
n n n n n n
The only refrigerant/temperature chart available to a refrigerati
n n n n n n n
on engineer lists the temperature In ﾟ
n n n n n n
C if the chart indicates a Celsius temperature of 4ﾟ
n n n n n n n n n
this is equivalent to -
n n n n n
...ANSWER .. 39.2ﾟ
The use of oil in the refrigeration machine is to -
n n n n n n n n n n
...ANSWER...Reduce wear and friction in the compressor parts n n n n n n n
Which of the following will connect to the Middle port on a gau
n n n n n n n n n n n n
ge manifold - ...ANSWER...Vacuum pump
n n n n
There is a decrease in efficiency of a reciprocating compressor.
n n n n n n n n n n
The most likely is caused by -
n n n n n n
...ANSWER...Leaking suction valve n n
,The suction and discharge valve of the reciprocating compresso
n n n n n n n n
r are mounted as follows -
n n n n n
...ANSWER...Discharge valve on top of the valve plate and suc n n n n n n n n n
tion valve below n n
A high side float is used to maintain -
n n n n n n n n
...ANSWER...Constant level of refrigerant in the evaporator n n n n n n
Which of these compressors is not a positive type compressor
n n n n n n n n n n
displacement - ...ANSWER...Centrifugal n n
When is emergency power not required according to code -
n n n n n n n n n
...ANSWER...Data centers n
What is the most widely used regulation book by operating engi
n n n n n n n n n n
neers - ...ANSWER...EPA n n
What type of refrigerant do you need FDNY approval for -
n n n n n n n n n n
...ANSWER...Propane
Centrifugal pressure is determined by - n n n n n
...ANSWER...Speed of motor
n n n
Liquid refrigerant that has passed through a metering device is
n n n n n n n n n n
at - ...ANSWER...Low pressure saturated liquid
n n n n n
What is the advantage of a shell and tube condenser as oposed t
n n n n n n n n n n n n
o a shell and coil condenser - ...ANSWER...Better heat transfer
n n n n n n n n n
,Where is the muffler located -
n n n n n
...ANSWER...Between the compressor and condenser
n n n n n
After recovering liquid refrigerant from a centrifugal chiller the
n n n n n n n n
next step shall be - ...ANSWER...Recover vapor
n n n n n n n
How long must a fire alarm log book be kept -
n n n n n n n n n n
...ANSWER...3 years n
What is the minimum requirement of an engineer needs to log
n n n n n n n n n n n
readings - ...ANSWER...Once per shift n n n n
When entering phase 2 firemen service what statement is correc
n n n n n n n n n
t- n
...ANSWER...The elevator operator is the only person that can
n n n n n n n n n n
control the elevator n n
You are the only engineer on duty with the machine running a v
n n n n n n n n n n n n
ice president tells you to shovel snow what should you do
n n n n n n n n n n
- ...ANSWER...Do not leave the building
n n n n n
How often must you do emergency power testing -
n n n n n n n n
...ANSWER...Monthly
What is the responsibility of AB29 certificate of fitness holder -
n n n n n n n n n n
...ANSWER...Inspect the battery system
n n n n
An engineer observes a gauge to read saturation pressure of re
n n n n n n n n n n
frigerant if chilled water circulated as the cooling medium this
n n n n n n n n n n
reading best be used to estimate the -
n n n n n n n
...ANSWER...Temperature of the chilled water being p n n n n n n
umped to the spaces being cooled
n n n n n
, Regardless of the ASHRAE refrigeration classification in use
n n n n n n n n
in the event of a refrigerant escape the engineer should be awar
n n n n n n n n n n n
e of - ...ANSWER...asphyxiation
n n n
When is a chemical fire extinguisher and system needed -
n n n n n n n n n
...ANSWER...Where water is not sufficient n n n n
What type of refrigerants found inside the machines gages -
n n n n n n n n n
...ANSWER...Same type as the refrigerant inside the machine n n n n n n n
Fireproof decorations in buildings are used for -
n n n n n n n
...ANSWER...They don't catch fire in an emergency n n n n n n
Water regulating valves are used for -
n n n n n n
...ANSWER...Maintain condenser pressure To a pre determine n n n n n n
d level
n
How long does it take to warm up a steam turbine -
n n n n n n n n n n n
...ANSWER...10 to 15 minutes n n n
Why is a pressure relief out better than a fusible plugs -
n n n n n n n n n n n
...ANSWER...Minimize refrigerant los n n
You are performing hot work near a sprinkler head what can yo
n n n n n n n n n n n
u do to prevent the fire alarm system from going off -
n n n n n n n n n n n
...ANSWER...Put a non combustible barrier to protect the sprin n n n n n n n n
kler
What type of sprinkler heads need inspecting -
n n n n n n n
...ANSWER...Automatic
EST TAURIS AND A STUDY GUIDE EXA
n n n n n n
M 2024 VERSION 400 QUESTIONS WITH
n n n n n n
DETAILED VERIFIED ANSWERS AND R n n n n
ATIONALES /A+ GRADE n n
ASSURED
FDNY Z51 EXAM 2024 n n n
A refrigerant engineer verifies that a chilled water pump is cavit
n n n n n n n n n n
y to of the following the most likely cause for this condition is -
n n n n n n n n n n n n n
...ANSWER...Water leaks through the mechanical seals
n n n n n n
The only refrigerant/temperature chart available to a refrigerati
n n n n n n n
on engineer lists the temperature In ﾟ
n n n n n n
C if the chart indicates a Celsius temperature of 4ﾟ
n n n n n n n n n
this is equivalent to -
n n n n n
...ANSWER .. 39.2ﾟ
The use of oil in the refrigeration machine is to -
n n n n n n n n n n
...ANSWER...Reduce wear and friction in the compressor parts n n n n n n n
Which of the following will connect to the Middle port on a gau
n n n n n n n n n n n n
ge manifold - ...ANSWER...Vacuum pump
n n n n
There is a decrease in efficiency of a reciprocating compressor.
n n n n n n n n n n
The most likely is caused by -
n n n n n n
...ANSWER...Leaking suction valve n n
,The suction and discharge valve of the reciprocating compresso
n n n n n n n n
r are mounted as follows -
n n n n n
...ANSWER...Discharge valve on top of the valve plate and suc n n n n n n n n n
tion valve below n n
A high side float is used to maintain -
n n n n n n n n
...ANSWER...Constant level of refrigerant in the evaporator n n n n n n
Which of these compressors is not a positive type compressor
n n n n n n n n n n
displacement - ...ANSWER...Centrifugal n n
When is emergency power not required according to code -
n n n n n n n n n
...ANSWER...Data centers n
What is the most widely used regulation book by operating engi
n n n n n n n n n n
neers - ...ANSWER...EPA n n
What type of refrigerant do you need FDNY approval for -
n n n n n n n n n n
...ANSWER...Propane
Centrifugal pressure is determined by - n n n n n
...ANSWER...Speed of motor
n n n
Liquid refrigerant that has passed through a metering device is
n n n n n n n n n n
at - ...ANSWER...Low pressure saturated liquid
n n n n n
What is the advantage of a shell and tube condenser as oposed t
n n n n n n n n n n n n
o a shell and coil condenser - ...ANSWER...Better heat transfer
n n n n n n n n n
,Where is the muffler located -
n n n n n
...ANSWER...Between the compressor and condenser
n n n n n
After recovering liquid refrigerant from a centrifugal chiller the
n n n n n n n n
next step shall be - ...ANSWER...Recover vapor
n n n n n n n
How long must a fire alarm log book be kept -
n n n n n n n n n n
...ANSWER...3 years n
What is the minimum requirement of an engineer needs to log
n n n n n n n n n n n
readings - ...ANSWER...Once per shift n n n n
When entering phase 2 firemen service what statement is correc
n n n n n n n n n
t- n
...ANSWER...The elevator operator is the only person that can
n n n n n n n n n n
control the elevator n n
You are the only engineer on duty with the machine running a v
n n n n n n n n n n n n
ice president tells you to shovel snow what should you do
n n n n n n n n n n
- ...ANSWER...Do not leave the building
n n n n n
How often must you do emergency power testing -
n n n n n n n n
...ANSWER...Monthly
What is the responsibility of AB29 certificate of fitness holder -
n n n n n n n n n n
...ANSWER...Inspect the battery system
n n n n
An engineer observes a gauge to read saturation pressure of re
n n n n n n n n n n
frigerant if chilled water circulated as the cooling medium this
n n n n n n n n n n
reading best be used to estimate the -
n n n n n n n
...ANSWER...Temperature of the chilled water being p n n n n n n
umped to the spaces being cooled
n n n n n
, Regardless of the ASHRAE refrigeration classification in use
n n n n n n n n
in the event of a refrigerant escape the engineer should be awar
n n n n n n n n n n n
e of - ...ANSWER...asphyxiation
n n n
When is a chemical fire extinguisher and system needed -
n n n n n n n n n
...ANSWER...Where water is not sufficient n n n n
What type of refrigerants found inside the machines gages -
n n n n n n n n n
...ANSWER...Same type as the refrigerant inside the machine n n n n n n n
Fireproof decorations in buildings are used for -
n n n n n n n
...ANSWER...They don't catch fire in an emergency n n n n n n
Water regulating valves are used for -
n n n n n n
...ANSWER...Maintain condenser pressure To a pre determine n n n n n n
d level
n
How long does it take to warm up a steam turbine -
n n n n n n n n n n n
...ANSWER...10 to 15 minutes n n n
Why is a pressure relief out better than a fusible plugs -
n n n n n n n n n n n
...ANSWER...Minimize refrigerant los n n
You are performing hot work near a sprinkler head what can yo
n n n n n n n n n n n
u do to prevent the fire alarm system from going off -
n n n n n n n n n n n
...ANSWER...Put a non combustible barrier to protect the sprin n n n n n n n n
kler
What type of sprinkler heads need inspecting -
n n n n n n n
...ANSWER...Automatic
