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Refrigeration and Air Conditioning

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

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

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Refrigeration and Air Conditioning
The cooling system used for supersonic aircrafts and rockets is

Simple air cooling system
Reduced ambient air cooling system
Bootstrap air cooling system
Regenerative air cooling system

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Refrigeration and Air Conditioning
The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called

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

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Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Steel
Copper
Brass
Aluminium

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Refrigeration and Air Conditioning
The desirable property of a refrigerant is

High latent heat of vaporisation
High critical temperature
Low boiling point
All of these

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Refrigeration and Air Conditioning
The mass of water vapour present in __________ is called absolute humidity.

1 kg of dry air
1 m3 of water
1 kg of wet air
1 m3 of dry air

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