ESCO Light Commercial Refrigeration
EXAM Questions And 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: - ANS
The difference between the temperature of the refrigerant boiling in the evaporator and the
temperature at theevaporator outlet is known as: - ANS
An expansion device that is stuck open will cause: - ANS
When measuring evaporator superheat on a commercial system that has a long suction line, the
pressure reading should be taken at the: - ANS
Superheat measurements are best taken: - ANS
Atechnician 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: - ANS
A TEV with an external equalizer is used on: - ANS
Dry type evaporators operate most efficiently with a superheat setting of approximately: - ANS
An evaporator used to chill liquids si operating with a normal superheat setting, but the system
is not cooling the product properly. Which of the following is the most likely cause? - ANS
What time interval is required between each superheat adjustment? - ANS
Alow temperature evaporator used for cooling space or product refrigeration: - ANS
Some special applications use aflooded evaporator (operated full of refrigerant). nI order to
maintain the proper level of liquid refrigerant, a
type metering device is used. - ANS
A properly functioning condenser will first; - ANS
The effect of an inefficient water cooled condenser will; - ANS
, The refrigerant condensing temperature in a water cooled condenser is normally about
higher than the leaving water. - ANS
The refrigerant in an air cooled condenser will normally condense at approximately
higher temperature than the air passing over it. - ANS
Workable head pressure during periods of lowambient temperature can be achieved by using; -
ANS
Cooling towers that pass air over water to remove system heat are limited in capacity by: - ANS
Parallel compressors often referred to as a rack system may use; - ANS
The major difference between a cooling tower and an evaporative condenser is: - ANS
Multiple compressors provide: - ANS
Adirty evaporator and subsequent low evaporator pressures will cause: - ANS
he thermostatic expansion valve (TV) maintains a constant__________ in the evaporator. - ANS
What type of ice si made with a commercial cie maker that uses a gear motor and auger? - ANS
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: - ANS
A_____________is usually required for ultra-low temperature applications. - ANS
A hot gas defrost cycle can be initiated by a: - ANS
When the defrost cycle is terminated, the evaporator fans will: - ANS
An off-cycle defrost method is often used on evaporators operating at a minimum of; - ANS
Excessive frost on the evaporator causes: - ANS
Automatic pump down systems are used to prevent: - ANS
An automatic pump down system requires a: - ANS
Short cycling ina pump down system is most likely caused by a leaking: - ANS
An evaporator pressure regulator valve (EPR valve) is a mechanical control that; - ANS
EXAM Questions And 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: - ANS
The difference between the temperature of the refrigerant boiling in the evaporator and the
temperature at theevaporator outlet is known as: - ANS
An expansion device that is stuck open will cause: - ANS
When measuring evaporator superheat on a commercial system that has a long suction line, the
pressure reading should be taken at the: - ANS
Superheat measurements are best taken: - ANS
Atechnician 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: - ANS
A TEV with an external equalizer is used on: - ANS
Dry type evaporators operate most efficiently with a superheat setting of approximately: - ANS
An evaporator used to chill liquids si operating with a normal superheat setting, but the system
is not cooling the product properly. Which of the following is the most likely cause? - ANS
What time interval is required between each superheat adjustment? - ANS
Alow temperature evaporator used for cooling space or product refrigeration: - ANS
Some special applications use aflooded evaporator (operated full of refrigerant). nI order to
maintain the proper level of liquid refrigerant, a
type metering device is used. - ANS
A properly functioning condenser will first; - ANS
The effect of an inefficient water cooled condenser will; - ANS
, The refrigerant condensing temperature in a water cooled condenser is normally about
higher than the leaving water. - ANS
The refrigerant in an air cooled condenser will normally condense at approximately
higher temperature than the air passing over it. - ANS
Workable head pressure during periods of lowambient temperature can be achieved by using; -
ANS
Cooling towers that pass air over water to remove system heat are limited in capacity by: - ANS
Parallel compressors often referred to as a rack system may use; - ANS
The major difference between a cooling tower and an evaporative condenser is: - ANS
Multiple compressors provide: - ANS
Adirty evaporator and subsequent low evaporator pressures will cause: - ANS
he thermostatic expansion valve (TV) maintains a constant__________ in the evaporator. - ANS
What type of ice si made with a commercial cie maker that uses a gear motor and auger? - ANS
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: - ANS
A_____________is usually required for ultra-low temperature applications. - ANS
A hot gas defrost cycle can be initiated by a: - ANS
When the defrost cycle is terminated, the evaporator fans will: - ANS
An off-cycle defrost method is often used on evaporators operating at a minimum of; - ANS
Excessive frost on the evaporator causes: - ANS
Automatic pump down systems are used to prevent: - ANS
An automatic pump down system requires a: - ANS
Short cycling ina pump down system is most likely caused by a leaking: - ANS
An evaporator pressure regulator valve (EPR valve) is a mechanical control that; - ANS
