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Refrigeration Excellence Questions and
Correct Answers/ Latest Update / Already
Graded
1. In a dry type (direct expansion) evaporator, liquid refrigerant must
boil away as close to the end of the coil as possible in order to:
A. Operate at high-efficiency
B. Ensure that Frost is not accumulate
C. Subcool the compressor
D. Ensure proper oil return
Ans: A. Operate at high-efficiency
2. The difference between the temperature of the refrigerant boiling in
the evaporator and the temperature at the evaporator outlet is known
as
A. Evaporator superheat
B. Latent heat
C. Evaporator sub-cooling
D. Sublimation
Ans: A. Evaporator superheat
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3. An expansion device that is stuck open will cause
A. Low suction pressure
B. A starved evaporator
C. Excessive superheat
D. A flooded evaporator
Ans: D. A flooded evaporator
4. When measuring evaporator superheat on a commercial system that
has a long suction line, the pressure reading should be taken at the
A. Compressor inlet
B. Evaporator outlet
C. Condenser outlet
D. Receiver Inlet
Ans: A. Compressor inlet
5. Superheat measurements are best taken
A. During a hot pulldown
B. At 8°F two 12°F
C. During defrost
D. With the system operating at design conditions
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Ans: D. With the system operating at design conditions
6. A technician is checking the superheat on a multi circuit evaporator
and finds one of the circuits has a superheat that is higher than the
others. This could be caused by
A. A dirty coil
B. A refrigerant overcharge
C. Uneven air distribution
D. A blocked distributor
Ans: D. A blocked distributor
7. A TXV with an external equalizer is used on
A. Evaporators with a high pressure drop
B. Evaporators with a low pressure drop
C. High temperature application is only
D. All evaporators
Ans: A. Evaporators with a high pressure drop
8. Dry type evaporators operate most efficiently with the superheat
setting of approximately
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A. 8°F to 12°F
B. 13°F to 19°F
C. 20°F to 30°F
D. 31°F to 40°F
Ans: A. 8°F to 12°F
9. An evaporator used to chill liquids is operating within normal
superheat setting. But the system is not cooling the product properly.
Which of the following is most likely the cause?
A. Overcharge of refrigerant
B. Undercharge of refrigerant
C. The circulator
D. The TXV
Ans: A. Overcharge of refrigerant
10. What time interval is required between each superheat
adjustment?
A. Not less than one hour
B. About 10 to 15 minutes
C. At least a half hour
All rights reserved © 2025/ 2026 |
Refrigeration Excellence Questions and
Correct Answers/ Latest Update / Already
Graded
1. In a dry type (direct expansion) evaporator, liquid refrigerant must
boil away as close to the end of the coil as possible in order to:
A. Operate at high-efficiency
B. Ensure that Frost is not accumulate
C. Subcool the compressor
D. Ensure proper oil return
Ans: A. Operate at high-efficiency
2. The difference between the temperature of the refrigerant boiling in
the evaporator and the temperature at the evaporator outlet is known
as
A. Evaporator superheat
B. Latent heat
C. Evaporator sub-cooling
D. Sublimation
Ans: A. Evaporator superheat
All rights reserved © 2025/ 2026 |
, Page |2
3. An expansion device that is stuck open will cause
A. Low suction pressure
B. A starved evaporator
C. Excessive superheat
D. A flooded evaporator
Ans: D. A flooded evaporator
4. When measuring evaporator superheat on a commercial system that
has a long suction line, the pressure reading should be taken at the
A. Compressor inlet
B. Evaporator outlet
C. Condenser outlet
D. Receiver Inlet
Ans: A. Compressor inlet
5. Superheat measurements are best taken
A. During a hot pulldown
B. At 8°F two 12°F
C. During defrost
D. With the system operating at design conditions
All rights reserved © 2025/ 2026 |
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Ans: D. With the system operating at design conditions
6. A technician is checking the superheat on a multi circuit evaporator
and finds one of the circuits has a superheat that is higher than the
others. This could be caused by
A. A dirty coil
B. A refrigerant overcharge
C. Uneven air distribution
D. A blocked distributor
Ans: D. A blocked distributor
7. A TXV with an external equalizer is used on
A. Evaporators with a high pressure drop
B. Evaporators with a low pressure drop
C. High temperature application is only
D. All evaporators
Ans: A. Evaporators with a high pressure drop
8. Dry type evaporators operate most efficiently with the superheat
setting of approximately
All rights reserved © 2025/ 2026 |
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A. 8°F to 12°F
B. 13°F to 19°F
C. 20°F to 30°F
D. 31°F to 40°F
Ans: A. 8°F to 12°F
9. An evaporator used to chill liquids is operating within normal
superheat setting. But the system is not cooling the product properly.
Which of the following is most likely the cause?
A. Overcharge of refrigerant
B. Undercharge of refrigerant
C. The circulator
D. The TXV
Ans: A. Overcharge of refrigerant
10. What time interval is required between each superheat
adjustment?
A. Not less than one hour
B. About 10 to 15 minutes
C. At least a half hour
All rights reserved © 2025/ 2026 |
