AIR 61B FINAL EXAM 2025 NEWEST
QUESTIONS AND DETAILED CORRECT
ANSWERS | A+ GRADE VERIFIED
ANSWERS
The reciprocating compressor has a built-in problem with
inefficiency which results from:
A) enclosing the motor in the same casing as the
compressor.
B) changes in ambient conditions
C) high clearance tolerances in the piston and crankshaft
areas.
D) its clearance volume.
E) all the above Correct Answer CLEARANCE VOLUME
The symptom which most readily indicates a blocked or
dirty condenser coil is:
A) high suction temperature.
B) compressor vibration.
C) high head pressure.
D) noisy operation.
E) All the above Correct Answer HIGH HEAD PRESSURE
High-temperature refrigeration applications will normally
provide box temperatures of ____.
A) 20 to 40°F
B) 32 to 50°F
C) 47 to 60°F
D) 50 to 67°F Correct Answer 47 to 60°F
,Evaporators that are operated full of liquid and are
equipped with a device to keep the liquid refrigerant from
passing to the compressor are known as ____.
A) locked evaporators
B) seized evaporators
C) flooded evaporators
D) stoned evaporators Correct Answer Flooded
evaporators
A direct expansion-type evaporator is also called a ____.
A) flooded evaporator
B) dry-type evaporator
C) multi-circuit evaporator
D) stamped evaporator Correct Answer DRY TYPE
A typical superheat for an evaporator operating under
normal conditions would be ____.
A) 4 to 6°F
B) 6 to 8°F
C) 8 to 12°F
D) 14 to 16°F Correct Answer 8 to 12°F
A normally operating water-cooled condenser is operating
with a 10° differential between water in and water out. If
scale forms on the water tubes and the entering water is
85°F, which of the following is possible?
A) The outlet water temperature will be lower than
expected.
B) The system head pressure will rise.
C) The water regulating valve will close.
,D) Both a and b are correct Correct Answer Both a and b
are correct
If the compression ratio of a system with a reciprocating
compressor decreases, the amount of refrigerant pumped
by the compressor ____.
A) will increase
B) will decrease
C) will remain the same
D) cannot be determined Correct Answer Will increase
Most of the heat energy in the suction vapor entering the
compressor is ____.
A) subcooled from the condenser
B) superheated from the condenser
C) superheated from the evaporator
D) subcooled from the evaporator Correct Answer C)
superheated from the evaporator
Rotary compressors are used primarily in ____.
A) large industrial refrigeration and air conditioning
systems
B) residential air conditioning
C) small commercial refrigeration units
D) high volume residential refrigeration Correct Answer
residential air conditioning
The clearance volume of a compressor cylinder is the
____.
A) amount of refrigerant vapor the compressor cylinder will
hold during each stroke
, B) volume by which the compressor is rated
C) volume of the space between the bottom of the valve
plate and the top of the piston at the top of the stroke
D) the total volume of the cylinder when the piston is at the
bottom dead-center Correct Answer C) volume of the
space between the bottom of the valve plate and the top of
the piston at the top of the stroke
Balanced port TXVs are used to ____.
A) feed refrigerant at a normal rate with low condenser
entering air temperatures
B) feed refrigerant at a normal rate with high condenser
entering air temperatures
C) stop refrigerant flow with high condenser entering air
temperatures
D) stop refrigerant flow with low condenser entering air
temperatures Correct Answer A) feed refrigerant at a
normal rate with low condenser entering air temperatures
The purpose of a capillary tube is to ____.
A) regulate the refrigerant flow into the evaporator
B) lower the pressure of the liquid refrigerant
C) lower the boiling point of the refrigerant
D) all of the above Correct Answer ALL OF THE ABOVE
The EPR valve is installed in the suction line at the
evaporator outlet and it ____.
A) modulates the refrigerant vapor to the compressor
B) prevents the boiling point in the evaporator from
dropping below a pre-set point
QUESTIONS AND DETAILED CORRECT
ANSWERS | A+ GRADE VERIFIED
ANSWERS
The reciprocating compressor has a built-in problem with
inefficiency which results from:
A) enclosing the motor in the same casing as the
compressor.
B) changes in ambient conditions
C) high clearance tolerances in the piston and crankshaft
areas.
D) its clearance volume.
E) all the above Correct Answer CLEARANCE VOLUME
The symptom which most readily indicates a blocked or
dirty condenser coil is:
A) high suction temperature.
B) compressor vibration.
C) high head pressure.
D) noisy operation.
E) All the above Correct Answer HIGH HEAD PRESSURE
High-temperature refrigeration applications will normally
provide box temperatures of ____.
A) 20 to 40°F
B) 32 to 50°F
C) 47 to 60°F
D) 50 to 67°F Correct Answer 47 to 60°F
,Evaporators that are operated full of liquid and are
equipped with a device to keep the liquid refrigerant from
passing to the compressor are known as ____.
A) locked evaporators
B) seized evaporators
C) flooded evaporators
D) stoned evaporators Correct Answer Flooded
evaporators
A direct expansion-type evaporator is also called a ____.
A) flooded evaporator
B) dry-type evaporator
C) multi-circuit evaporator
D) stamped evaporator Correct Answer DRY TYPE
A typical superheat for an evaporator operating under
normal conditions would be ____.
A) 4 to 6°F
B) 6 to 8°F
C) 8 to 12°F
D) 14 to 16°F Correct Answer 8 to 12°F
A normally operating water-cooled condenser is operating
with a 10° differential between water in and water out. If
scale forms on the water tubes and the entering water is
85°F, which of the following is possible?
A) The outlet water temperature will be lower than
expected.
B) The system head pressure will rise.
C) The water regulating valve will close.
,D) Both a and b are correct Correct Answer Both a and b
are correct
If the compression ratio of a system with a reciprocating
compressor decreases, the amount of refrigerant pumped
by the compressor ____.
A) will increase
B) will decrease
C) will remain the same
D) cannot be determined Correct Answer Will increase
Most of the heat energy in the suction vapor entering the
compressor is ____.
A) subcooled from the condenser
B) superheated from the condenser
C) superheated from the evaporator
D) subcooled from the evaporator Correct Answer C)
superheated from the evaporator
Rotary compressors are used primarily in ____.
A) large industrial refrigeration and air conditioning
systems
B) residential air conditioning
C) small commercial refrigeration units
D) high volume residential refrigeration Correct Answer
residential air conditioning
The clearance volume of a compressor cylinder is the
____.
A) amount of refrigerant vapor the compressor cylinder will
hold during each stroke
, B) volume by which the compressor is rated
C) volume of the space between the bottom of the valve
plate and the top of the piston at the top of the stroke
D) the total volume of the cylinder when the piston is at the
bottom dead-center Correct Answer C) volume of the
space between the bottom of the valve plate and the top of
the piston at the top of the stroke
Balanced port TXVs are used to ____.
A) feed refrigerant at a normal rate with low condenser
entering air temperatures
B) feed refrigerant at a normal rate with high condenser
entering air temperatures
C) stop refrigerant flow with high condenser entering air
temperatures
D) stop refrigerant flow with low condenser entering air
temperatures Correct Answer A) feed refrigerant at a
normal rate with low condenser entering air temperatures
The purpose of a capillary tube is to ____.
A) regulate the refrigerant flow into the evaporator
B) lower the pressure of the liquid refrigerant
C) lower the boiling point of the refrigerant
D) all of the above Correct Answer ALL OF THE ABOVE
The EPR valve is installed in the suction line at the
evaporator outlet and it ____.
A) modulates the refrigerant vapor to the compressor
B) prevents the boiling point in the evaporator from
dropping below a pre-set point
