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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m/h
m²/h
m²/hK
m/hK

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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

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

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Refrigeration and Air Conditioning
Absorption system normally uses the following refrigerant

CO2
Freon-11
Ammonia
Freon-22

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Refrigeration and Air Conditioning
During sensible cooling,

Wet bulb temperature increases
Specific humidity increases
Partial pressure of vapour remains constant
Relative humidity remains constant

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Refrigeration and Air Conditioning
The bank of tubes at the back of domestic refrigerator is

Capillary tubes
Evaporator tubes
Condenser tubes
Refrigerant cooling tubes

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Refrigeration and Air Conditioning
Air refrigerator works on

Bell Coleman cycle
None of these
Both (A) and (B)
Reversed Carnot cycle

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