FDNY Z51 EXAM 3 FINAL PRACTICE
ASSESSMENT 2026 QUESTIONS AND
ANSWERS STUDY PREPARATION PACK
◉ water and moisture is serious problem in a refrigerant system
how to avoid.
Answer: 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.
Answer: 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.
Answer: The outlet end of the coil
◉ 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
◉ 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
ASSESSMENT 2026 QUESTIONS AND
ANSWERS STUDY PREPARATION PACK
◉ water and moisture is serious problem in a refrigerant system
how to avoid.
Answer: 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.
Answer: 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.
Answer: The outlet end of the coil
◉ 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
◉ 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
