Refrigeration Excellence Exam Questions
and Answers Graded A+
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 - Correct answer-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 - Correct answer-A. Evaporator superheat
3. An expansion device that is stuck open will cause
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,A. Low suction pressure
B. A starved evaporator
C. Excessive superheat
D. A flooded evaporator - Correct answer-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 - Correct answer-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 - Correct answer-D. With the
system operating at design conditions
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,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 - Correct answer-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 - Correct answer-A. Evaporators with a high pressure drop
8. Dry type evaporators operate most efficiently with the superheat setting of
approximately
A. 8°F to 12°F
B. 13°F to 19°F
C. 20°F to 30°F
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, D. 31°F to 40°F - Correct answer-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 - Correct answer-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
D. No time delay - Correct answer-B. About 10 to 15 minutes
11. A low temperature evaporator used for cooling space or product refrigeration
A. Is the same as one used for medium or high temperatures
B. Must have fins space closer together
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and Answers Graded A+
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 - Correct answer-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 - Correct answer-A. Evaporator superheat
3. An expansion device that is stuck open will cause
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,A. Low suction pressure
B. A starved evaporator
C. Excessive superheat
D. A flooded evaporator - Correct answer-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 - Correct answer-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 - Correct answer-D. With the
system operating at design conditions
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
,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 - Correct answer-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 - Correct answer-A. Evaporators with a high pressure drop
8. Dry type evaporators operate most efficiently with the superheat setting of
approximately
A. 8°F to 12°F
B. 13°F to 19°F
C. 20°F to 30°F
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, D. 31°F to 40°F - Correct answer-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 - Correct answer-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
D. No time delay - Correct answer-B. About 10 to 15 minutes
11. A low temperature evaporator used for cooling space or product refrigeration
A. Is the same as one used for medium or high temperatures
B. Must have fins space closer together
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