Exam (elaborations)
ESCO Light Commercial Refrigeration EXAM
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ESCO Light Commercial Refrigeration EXAM
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ESCO Light Commercial Refrigeration EXAMIn 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
The difference between the temperature of the refrigerant boiling in the evaporator
and the temperature at theevaporator outlet is known as: - ANSWER
An expansion device that is stuck open will cause: - ANSWER
When measuring evaporator superheat on a commercial system that has a long
suction line, the pressure reading should be taken at the: - ANSWER
Superheat measurements are best taken: - ANSWER
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: -
ANSWER
A TEV with an external equalizer is used on: - ANSWER
Dry type evaporators operate most efficiently with a superheat setting of
approximately: - ANSWER
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? - ANSWER
What time interval is required between each superheat adjustment? - ANSWER
Alow temperature evaporator used for cooling space or product refrigeration: -
ANSWER
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. - ANSWER
A properly functioning condenser will first; - ANSWER
The effect of an inefficient water cooled condenser will; - ANSWER
The refrigerant condensing temperature in a water cooled condenser is normally
about
higher than the leaving water. - ANSWER
The refrigerant in an air cooled condenser will normally condense at approximately
higher temperature than the air passing over it. - ANSWER
, Workable head pressure during periods of lowambient temperature can be achieved
by using; - ANSWER
Cooling towers that pass air over water to remove system heat are limited in capacity
by: - ANSWER
Parallel compressors often referred to as a rack system may use; - ANSWER
The major difference between a cooling tower and an evaporative condenser is: -
ANSWER
Multiple compressors provide: - ANSWER
Adirty evaporator and subsequent low evaporator pressures will cause: - ANSWER
he thermostatic expansion valve (TV) maintains a constant__________ in the
evaporator. - ANSWER
What type of ice si made with a commercial cie maker that uses a gear motor and
auger? - ANSWER
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
A_____________is usually required for ultra-low temperature applications. -
ANSWER
A hot gas defrost cycle can be initiated by a: - ANSWER
When the defrost cycle is terminated, the evaporator fans will: - ANSWER
An off-cycle defrost method is often used on evaporators operating at a minimum of;
- ANSWER
Excessive frost on the evaporator causes: - ANSWER
Automatic pump down systems are used to prevent: - ANSWER
An automatic pump down system requires a: - ANSWER
Short cycling ina pump down system is most likely caused by a leaking: - ANSWER
An evaporator pressure regulator valve (EPR valve) is a mechanical control that; -
ANSWER
The "Low-Ambient Control" is used to control: - ANSWER
The crankcase heater is used to prevent: - ANSWER
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