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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

Slightly above atmospheric pressure
Atmospheric pressure
56 bars
24 bars

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Domestic refrigerators
Air conditioning
Commercial refrigerators
Gas liquefaction

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Refrigeration and Air Conditioning
Critical pressure of a liquid is the pressure

Above which liquid will remain liquid
Above which liquid becomes vapour
Above which liquid becomes solid
Above which liquid becomes gas

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Is immaterial
Increases heat transfer rate
Results in loss of heat due to poor heat transfer
Can be avoided by proper design

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Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Low pressure side near receiver
High pressure side close to receiver
Delivery of compressor
Suction of compressor

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Refrigeration and Air Conditioning
The process, generally used in winter air-conditioning to warm and humidity the air, is called

Humidification
Dehumidification
Cooling and dehumidification
Heating and humidification

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MORE MCQ ON Refrigeration and Air Conditioning

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