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Refrigeration Excellence Questions with Detailed Verified
Answers
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
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
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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 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
A. 8°F to 12°F
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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
D. No time delay Ans: ✓ ✓ ✓ 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
C. Must be frosted periodically
D. Must be defrosted periodically Ans: ✓ ✓ ✓ D. Must be defrosted periodically
12. Some special applications use a flooded evaporator (operated full of refrigerant) in order to
maintain the proper level of liquid refrigerant, a ______ type devices used.
A. High side float
B. Capillary tube
© Get it right 2025 Getaway - Stuvia US All rights reserved
Refrigeration Excellence Questions with Detailed Verified
Answers
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
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
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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 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
A. 8°F to 12°F
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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
D. No time delay Ans: ✓ ✓ ✓ 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
C. Must be frosted periodically
D. Must be defrosted periodically Ans: ✓ ✓ ✓ D. Must be defrosted periodically
12. Some special applications use a flooded evaporator (operated full of refrigerant) in order to
maintain the proper level of liquid refrigerant, a ______ type devices used.
A. High side float
B. Capillary tube
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