ESCO Light Commercial Refrigeration Exam.pdf file:///C:/Users/HP/Desktop/New%20fl/ESCO%20Light%20Comme
ESCO Commercial Refrigeration Certification Exam
Questions & Verified Answers
1. In a dry type (direct expansion) evaporator, liquid refrigerant must boil awayas close to
the end of the coil as possible in order to
A. operate at high efficiency.
B. ensure that frost does not accumulate.
C. sub-cool the compressor.
D. ensure proper oil return
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.
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,ESCO Light Commercial Refrigeration Exam.pdf file:///C:/Users/HP/Desktop/New%20fl/ESCO%20Light%20Comme
C. evaporator sub-cooling.
D. sublimation
Answer 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:
Answer D. a flooded evaporator
4. When measuring evaporator superheat on a commercial system that has along suction
line, the pressure reading should be taken at the
A. compressor inlet.
B. evaporator outlet.
C. condenser outlet.
D. receiver Inlet
Answer A. compressor inlet. (Suction Line)
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5. Superheat measurements are best taken
A. during a hot pull down.
B. at 8°F to 12°F.
C. during defrost.
D. with the system operating at design conditions
Answer D. with the system operatingat 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.Thiscould be caused by
A. a dirty coil.
B. a refrigerant overcharge
C. uneven air distribution.
D. a blocked distributor
Answer D. a blocked distributor.
7. A TEV with an external equalizer is used on
A. evaporators with a high pressure drop.
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B. evaporators with a low pressure drop.
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ESCO Commercial Refrigeration Certification Exam
Questions & Verified Answers
1. In a dry type (direct expansion) evaporator, liquid refrigerant must boil awayas close to
the end of the coil as possible in order to
A. operate at high efficiency.
B. ensure that frost does not accumulate.
C. sub-cool the compressor.
D. ensure proper oil return
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.
1 of 53 10/8/2024, 8:21
,ESCO Light Commercial Refrigeration Exam.pdf file:///C:/Users/HP/Desktop/New%20fl/ESCO%20Light%20Comme
C. evaporator sub-cooling.
D. sublimation
Answer 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:
Answer D. a flooded evaporator
4. When measuring evaporator superheat on a commercial system that has along suction
line, the pressure reading should be taken at the
A. compressor inlet.
B. evaporator outlet.
C. condenser outlet.
D. receiver Inlet
Answer A. compressor inlet. (Suction Line)
2 of 53 10/8/2024, 8:21
,ESCO Light Commercial Refrigeration Exam.pdf file:///C:/Users/HP/Desktop/New%20fl/ESCO%20Light%20Comme
5. Superheat measurements are best taken
A. during a hot pull down.
B. at 8°F to 12°F.
C. during defrost.
D. with the system operating at design conditions
Answer D. with the system operatingat 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.Thiscould be caused by
A. a dirty coil.
B. a refrigerant overcharge
C. uneven air distribution.
D. a blocked distributor
Answer D. a blocked distributor.
7. A TEV with an external equalizer is used on
A. evaporators with a high pressure drop.
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,ESCO Light Commercial Refrigeration Exam.pdf file:///C:/Users/HP/Desktop/New%20fl/ESCO%20Light%20Comme
B. evaporators with a low pressure drop.
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