1
Refrigeration Questions with Answers (100%
Correct 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
, 2
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
Refrigeration Questions with Answers (100%
Correct 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
, 2
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
