Refrigeration Exam Updated
Questions and Answers (2025/2026)
(Verified Answers)
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: - Answer- Operate at high-efficiency
The difference between the temperature of the temperature of the refrigerant boiling in
the evaporator and the temperature at the evaporator outlet is known as the: - Answer-
Evaporator superheat
An expansion device that is stuck open will cause - Answer- A flooded evaporator
When measuring evaporator superheat on a commercial system that has a long suction
line, the pressure reading should be taken at the: - Answer- Compressor inlet
Superheat measurements are best taken: - Answer- With the system operating at
design conditions
A technician checking the superheat on a multi circuit evaporator and finds one of the
circuits bas a superheat that is higher than the others, this could be caused by: -
Answer- A blocked distributor
YXV with an eternal equalizer is used on: - Answer- Evaporator with high pressure drop
A dry type evaporator operates most efficiently with the superheat setting
approximately: - Answer- 8F & 12F
An evaporator used to chill liquids is operating within normal superheat setting, but the
system is not cooling the product properly. What is the cause? - Answer- Overcharge of
refrigerant
What time interval is required between each superheat adjustment? - Answer- 10 - 15
minutes
A low temperature evaporator used for cooling space or product refrigeration must
what? - Answer- Must be defrosted periodically
Some special applications use a flooded evaporator (full of refrigerant) in order to
maintain the proper level of liquid refrigerant, a ______ type device is used. - Answer-
Low side float
A properly functioning condenser will first - - Answer- De-superheat, then sub-cool
, The effect of an inefficient water cooled condenser will - Answer- Act the same as an air
cooled condenser
The refrigerant condensing temperature in a water cooled condenser is normally about
____ higher than the leaving water. - Answer- 10F
The refrigerant and an air cooled condenser will normally contend at approximately
____ higher temperature than the air passing over it. - Answer- 30F
Workable head pressure during periods of low ambient temperature can be achieved
using? - Answer- Fan cycle control
Cooling towers that pass air over water to remove system heat are limited in capacity
by: - Answer- Outside air wet bulb temperature
Parallel compressors often referred to as a rack system may use: - Answer- A common
suction, but not a common discharge header
Major difference between a cooling tower and an evaporator condenser is: - Answer-
The refrigerant is indirectly cooled in the cooling tower
Multiple compressors provide: - Answer- Capacity control
A dirty evaporator and subsequent low evaporator pressures will cause: - Answer- Low
compression rates
The thermostatic expansion valve (TEV) maintains a constant ____ in the evaporator. -
Answer- Superheat
What type of ice is made with commercial ice maker that uses a gear motor and auger?
- Answer- Shaved ice
Some capillary tube systems take advantage of heat exchange by soldering the
capillary tube to the suction line. In order to obtain the correct superheat reading, it must
be taken: - Answer- After the capillary tube suction line heat exchanger
A _____ is usually required for ultra low temperature applications. - Answer- Cascade
system
A hot gas defrost cycle can be initiated by a: - Answer- Timer
When the defrost cycle is terminated, the evaporator fans will: - Answer- Delay coming
on
Questions and Answers (2025/2026)
(Verified Answers)
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: - Answer- Operate at high-efficiency
The difference between the temperature of the temperature of the refrigerant boiling in
the evaporator and the temperature at the evaporator outlet is known as the: - Answer-
Evaporator superheat
An expansion device that is stuck open will cause - Answer- A flooded evaporator
When measuring evaporator superheat on a commercial system that has a long suction
line, the pressure reading should be taken at the: - Answer- Compressor inlet
Superheat measurements are best taken: - Answer- With the system operating at
design conditions
A technician checking the superheat on a multi circuit evaporator and finds one of the
circuits bas a superheat that is higher than the others, this could be caused by: -
Answer- A blocked distributor
YXV with an eternal equalizer is used on: - Answer- Evaporator with high pressure drop
A dry type evaporator operates most efficiently with the superheat setting
approximately: - Answer- 8F & 12F
An evaporator used to chill liquids is operating within normal superheat setting, but the
system is not cooling the product properly. What is the cause? - Answer- Overcharge of
refrigerant
What time interval is required between each superheat adjustment? - Answer- 10 - 15
minutes
A low temperature evaporator used for cooling space or product refrigeration must
what? - Answer- Must be defrosted periodically
Some special applications use a flooded evaporator (full of refrigerant) in order to
maintain the proper level of liquid refrigerant, a ______ type device is used. - Answer-
Low side float
A properly functioning condenser will first - - Answer- De-superheat, then sub-cool
, The effect of an inefficient water cooled condenser will - Answer- Act the same as an air
cooled condenser
The refrigerant condensing temperature in a water cooled condenser is normally about
____ higher than the leaving water. - Answer- 10F
The refrigerant and an air cooled condenser will normally contend at approximately
____ higher temperature than the air passing over it. - Answer- 30F
Workable head pressure during periods of low ambient temperature can be achieved
using? - Answer- Fan cycle control
Cooling towers that pass air over water to remove system heat are limited in capacity
by: - Answer- Outside air wet bulb temperature
Parallel compressors often referred to as a rack system may use: - Answer- A common
suction, but not a common discharge header
Major difference between a cooling tower and an evaporator condenser is: - Answer-
The refrigerant is indirectly cooled in the cooling tower
Multiple compressors provide: - Answer- Capacity control
A dirty evaporator and subsequent low evaporator pressures will cause: - Answer- Low
compression rates
The thermostatic expansion valve (TEV) maintains a constant ____ in the evaporator. -
Answer- Superheat
What type of ice is made with commercial ice maker that uses a gear motor and auger?
- Answer- Shaved ice
Some capillary tube systems take advantage of heat exchange by soldering the
capillary tube to the suction line. In order to obtain the correct superheat reading, it must
be taken: - Answer- After the capillary tube suction line heat exchanger
A _____ is usually required for ultra low temperature applications. - Answer- Cascade
system
A hot gas defrost cycle can be initiated by a: - Answer- Timer
When the defrost cycle is terminated, the evaporator fans will: - Answer- Delay coming
on
