A-49 FDNY EXAM 6 2026 EXAM SCRIPT TEST
PAPER QUESTIONS AND SOLUTIONS GRADED
A+
◉ The type of refrigerant system that is least likely to leak
refrigerant into the building space that are cooled
Answer: The indirect system
◉ The suction pressure of a reciprocating compressor is 65PSIG. the
discharge pressure of this compressor is 120PSIG. the atmospheric
is 14.7 PSI. the compression ratio for the given condition is closet to:
Answer: 1.69
◉ A super heated vapor is a ?
Answer: Dry vapor above the saturation temperature
◉ A refrigerant engineer verifies that a condenser water pump is
cavitating. of the following the most likely cause for this condition is:
Answer: A faulty cooling tower water level controller
◉ A centrifugal water pump is known as a lift pump when the:
,Answer: The water supply to the pump suction inlet is below the
pump level
◉ A TXV is used to maintain constant:
Answer: Evaporator superheat
◉ The chilled water supply to the building is 55F. if the chiller is
being used for human comfort, should you be concerned about this ,
and why?
Answer: Yes, this temperature is too high for human comfort
purpose
◉ The packing gland of a centrifugal pump serves to:
Answer: The drip part of the packing gland gives evidence that there
is water in the pump
◉ Capacity control of a reciprocating hermetic compressor is
typically achieved through
Answer: Operation of the hot gas bypass valve
◉ The most important reason to sub-cool the refrigerant in the
condenser is to ensure that:
Answer: A pure liquid refrigerant will enter the metering device
,◉ A refrigeration engineer is logging reading from a reciprocating
system. compressor discharge temperature have dropped
significantly and the suction line pressure is high. which of the
following that may be causing this set of condition.
Answer: An expansion valve that is open to wide
◉ A low side float valve is used to maintain:
Answer: The level of the refrigerant in the evaporator
◉ Regarding fire safety, which ASHARE refrigerant safety
classification indicates no flammability and lower the toxicity?
Answer: A1
◉ When an expansion valve is operating properly, at the end of the
evaporator will contain:
Answer: Only superheated vapor
◉ What information is not contained in a material safety data sheet-
MSDS?
Answer: Cost of material
◉ In a steam turbine, what is the function of the kingsbury thrust
bearing
Answer: Maintain axial positioning of the rotor shaft
, ◉ A centrifugal water pump is considered to be fully primed when
Answer: The pump is full of liquid
◉ Copper tubing refrigerant lines must be installed for a new
system. it is a well known service practice that tubing collapses at
bends that must be made, the refrigerant engineer should use
Answer: Lever type tubing bender
◉ A reciprocating compressor is making a knocking sound during
operation. if the refrigerant worn parts are not causing the knocking,
what is probably the cause
Answer: The slugging of the liquid refrigerant
◉ In order for a refrigerant to become superheated in a section of
the lowside refrigerant line:
Answer: Where no liquid refrigerant is present
◉ All liquid has been recovered from a system to be overhauled, the
system
Answer: Should not be opened until all vapor has been removed
PAPER QUESTIONS AND SOLUTIONS GRADED
A+
◉ The type of refrigerant system that is least likely to leak
refrigerant into the building space that are cooled
Answer: The indirect system
◉ The suction pressure of a reciprocating compressor is 65PSIG. the
discharge pressure of this compressor is 120PSIG. the atmospheric
is 14.7 PSI. the compression ratio for the given condition is closet to:
Answer: 1.69
◉ A super heated vapor is a ?
Answer: Dry vapor above the saturation temperature
◉ A refrigerant engineer verifies that a condenser water pump is
cavitating. of the following the most likely cause for this condition is:
Answer: A faulty cooling tower water level controller
◉ A centrifugal water pump is known as a lift pump when the:
,Answer: The water supply to the pump suction inlet is below the
pump level
◉ A TXV is used to maintain constant:
Answer: Evaporator superheat
◉ The chilled water supply to the building is 55F. if the chiller is
being used for human comfort, should you be concerned about this ,
and why?
Answer: Yes, this temperature is too high for human comfort
purpose
◉ The packing gland of a centrifugal pump serves to:
Answer: The drip part of the packing gland gives evidence that there
is water in the pump
◉ Capacity control of a reciprocating hermetic compressor is
typically achieved through
Answer: Operation of the hot gas bypass valve
◉ The most important reason to sub-cool the refrigerant in the
condenser is to ensure that:
Answer: A pure liquid refrigerant will enter the metering device
,◉ A refrigeration engineer is logging reading from a reciprocating
system. compressor discharge temperature have dropped
significantly and the suction line pressure is high. which of the
following that may be causing this set of condition.
Answer: An expansion valve that is open to wide
◉ A low side float valve is used to maintain:
Answer: The level of the refrigerant in the evaporator
◉ Regarding fire safety, which ASHARE refrigerant safety
classification indicates no flammability and lower the toxicity?
Answer: A1
◉ When an expansion valve is operating properly, at the end of the
evaporator will contain:
Answer: Only superheated vapor
◉ What information is not contained in a material safety data sheet-
MSDS?
Answer: Cost of material
◉ In a steam turbine, what is the function of the kingsbury thrust
bearing
Answer: Maintain axial positioning of the rotor shaft
, ◉ A centrifugal water pump is considered to be fully primed when
Answer: The pump is full of liquid
◉ Copper tubing refrigerant lines must be installed for a new
system. it is a well known service practice that tubing collapses at
bends that must be made, the refrigerant engineer should use
Answer: Lever type tubing bender
◉ A reciprocating compressor is making a knocking sound during
operation. if the refrigerant worn parts are not causing the knocking,
what is probably the cause
Answer: The slugging of the liquid refrigerant
◉ In order for a refrigerant to become superheated in a section of
the lowside refrigerant line:
Answer: Where no liquid refrigerant is present
◉ All liquid has been recovered from a system to be overhauled, the
system
Answer: Should not be opened until all vapor has been removed
