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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The sub-cooling in a refrigeration cycle

None of these
Increases C.O.P.
Decreases C.O.P.
Does not alter C.O.P.

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Refrigeration and Air Conditioning
The capillary tube is not used in large capacity refrigeration systems because

Required pressure drop cannot be achieved
Cost is too high
Capacity control is not possible
It is made of copper

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

Dehumidification
Humidification
Cooling and dehumidification
Heating and humidification

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Gas liquefaction
Domestic refrigerators
Air conditioning
Commercial refrigerators

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Refrigeration and Air Conditioning
The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

Wet bulb temperature
Dew point temperature
Dry bulb temperature
None of these

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Refrigeration and Air Conditioning
Which of the following refrigerant is highly toxic and flammable?

Carbon dioxide
R-12
Sulphur dioxide
Ammonia

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