ESCO Light Commercial Refrigeration EXAM 2024/2025 with Complete Solutions.
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Course
ESCO
Institution
ESCO
ESCO Light Commercial Refrigeration EXAM 2024/2025 with Complete Solutions. 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: A. operate at high efficiency. B. ensure that frost does not accumulate. C. sub-cool th...
ESCO Light Commercial Refrigeration EXAM 2024/2025
with Complete Solutions.
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-
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