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RAC Compressors & Metering Devices
Questions and Answers Latest 2026
If the compression ratio of a system with a reciprocating
compressor decreases, the amount of refrigerant pumped
by the compressor ____.
Select one:
a.will increase
b.will decrease
c.will remain the same
d.cannot be determined Ans: a. will increase
If the suction valve in a reciprocating compressor is
leaking slightly, the ____.
Select one:
a.
cooling capacity will be reduced
b.
flow rate of refrigerant through the system will increase
c.
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compressor can overheat
d.
both a and c Ans: d. both a and c
Liquid entering the compression chamber of a
reciprocating compressor can lead to ____.
Select one:
a.
damaged valves
b.
damaged piston rings
c.
damaged expansion valves
d.
both a and b Ans: d. both a and b
Most of the heat energy in the suction vapor entering the
compressor is ____.
Select one:
a.heat of compression
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b.sensible heat
c.latent heat
d.defrost heat Ans: c. latent heat
A refrigeration system is operating with a vapor charged
thermostatic expansion valve. The thermal bulb is
sensing a suction line temperature that is higher than the
temperature that allows liquid to be present in the bulb.
Any additional increases in the evaporator load will ____.
Select one:
a.increase the bulb pressure and cause the thermostatic
expansion valve to open
b.increase the evaporator pressure and cause the
thermostatic expansion valve to close
c.decrease the spring pressure and cause the
thermostatic expansion valve to open
d.have no effect on the position of the needle (pin) in the
seat Ans: d. have no effect on the position of the needle
(pin) in the seat
A thermostatic expansion valve controls refrigerant flow
to the evaporator based on ____.
Select one:
a.rate of liquid vaporization
© 2025 All rights reserved
RAC Compressors & Metering Devices
Questions and Answers Latest 2026
If the compression ratio of a system with a reciprocating
compressor decreases, the amount of refrigerant pumped
by the compressor ____.
Select one:
a.will increase
b.will decrease
c.will remain the same
d.cannot be determined Ans: a. will increase
If the suction valve in a reciprocating compressor is
leaking slightly, the ____.
Select one:
a.
cooling capacity will be reduced
b.
flow rate of refrigerant through the system will increase
c.
© 2025 All rights reserved
, 2 | Page
compressor can overheat
d.
both a and c Ans: d. both a and c
Liquid entering the compression chamber of a
reciprocating compressor can lead to ____.
Select one:
a.
damaged valves
b.
damaged piston rings
c.
damaged expansion valves
d.
both a and b Ans: d. both a and b
Most of the heat energy in the suction vapor entering the
compressor is ____.
Select one:
a.heat of compression
© 2025 All rights reserved
, 3 | Page
b.sensible heat
c.latent heat
d.defrost heat Ans: c. latent heat
A refrigeration system is operating with a vapor charged
thermostatic expansion valve. The thermal bulb is
sensing a suction line temperature that is higher than the
temperature that allows liquid to be present in the bulb.
Any additional increases in the evaporator load will ____.
Select one:
a.increase the bulb pressure and cause the thermostatic
expansion valve to open
b.increase the evaporator pressure and cause the
thermostatic expansion valve to close
c.decrease the spring pressure and cause the
thermostatic expansion valve to open
d.have no effect on the position of the needle (pin) in the
seat Ans: d. have no effect on the position of the needle
(pin) in the seat
A thermostatic expansion valve controls refrigerant flow
to the evaporator based on ____.
Select one:
a.rate of liquid vaporization
© 2025 All rights reserved
