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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m/hK
m/h
m²/hK

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Refrigeration and Air Conditioning
The Freon group of refrigerants are

Hydrocarbon refrigerants
Halocarbon refrigerants
Zoetrope refrigerants
Inorganic refrigerants

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Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

Cooled and dehumidified
Heated and dehumidified
Cooled and humidified
Heated and humidified

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Refrigeration and Air Conditioning
During dehumidification process, _________ remains constant.

Dry bulb temperature
Specific humidity
Relative humidity
Wet bulb temperature

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Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Critical pressure of refrigerant
Much above critical pressure
Much below critical pressure
Near critical pressure

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

Lowers evaporation temperature
All of these
Lowers compressor capacity because vapour is lighter
Increases power required per ton of refrigeration

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