1|Page
FDNY Z-51 Exam Newest 2025-2026 Complete
All Questions And Correct Detailed Answers
(Verified Answers) |Already Graded A+||Brand
New Version!
water and moisture is serious problem in a refrigerant system how to
avoid
proper evaluation at the charging of the system
while on duty a refrigeration engineer notic That the suction line to the
compressor and part of the compressor itself is frosted over the
following the most likely reason for this condition would be
There is not enough Refrigerant in the system
While doing a routine inspection the engineer notices the bulb of the
TXV on the floor. The refrigerant engineer should have attached a bulb
at the
The outlet end of the coil
,2|Page
A refrigerant engineer verifies that a chilled water pump is cavity to of
the following the most likely cause for this condition is
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
39.2ﾟ F° Temp= C° × 1.8 + 32= 4×1.8= 7.2+32=39.2
F° Convert + 32
C°Convert - 32
C° = F(Temp) - 32° ÷1.8
The use of oil in the refrigeration machine is to
Reduce wear and friction in the compressor parts
Which of the following will connect to the Middle port on a gauge
manifold
Vacuum pump
, 3|Page
There is a decrease in efficiency of a reciprocating compressor. The most
likely is caused by
Leaking suction valve
The suction and discharge valve of the reciprocating compressor are
mounted as follows
Discharge valve on top of the valve plate and suction valve on the
bottom
A high side float is used to maintain
Constant level of refrigerant in the evaporator
Which of these compressors is non positive type compressor
displacement
Centrifugal
When is emergency power not required according to code
Data centers
FDNY Z-51 Exam Newest 2025-2026 Complete
All Questions And Correct Detailed Answers
(Verified Answers) |Already Graded A+||Brand
New Version!
water and moisture is serious problem in a refrigerant system how to
avoid
proper evaluation at the charging of the system
while on duty a refrigeration engineer notic That the suction line to the
compressor and part of the compressor itself is frosted over the
following the most likely reason for this condition would be
There is not enough Refrigerant in the system
While doing a routine inspection the engineer notices the bulb of the
TXV on the floor. The refrigerant engineer should have attached a bulb
at the
The outlet end of the coil
,2|Page
A refrigerant engineer verifies that a chilled water pump is cavity to of
the following the most likely cause for this condition is
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
39.2ﾟ F° Temp= C° × 1.8 + 32= 4×1.8= 7.2+32=39.2
F° Convert + 32
C°Convert - 32
C° = F(Temp) - 32° ÷1.8
The use of oil in the refrigeration machine is to
Reduce wear and friction in the compressor parts
Which of the following will connect to the Middle port on a gauge
manifold
Vacuum pump
, 3|Page
There is a decrease in efficiency of a reciprocating compressor. The most
likely is caused by
Leaking suction valve
The suction and discharge valve of the reciprocating compressor are
mounted as follows
Discharge valve on top of the valve plate and suction valve on the
bottom
A high side float is used to maintain
Constant level of refrigerant in the evaporator
Which of these compressors is non positive type compressor
displacement
Centrifugal
When is emergency power not required according to code
Data centers
