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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The COP of a domestic refrigerator

Is more than 1
Is less than 1
Depends upon the make
Is equal to 1

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Refrigeration and Air Conditioning
The refrigerant supplied to a compressor must be

Superheated vapour refrigerant
A mixture of liquid and vapour refrigerant
None of these
Dry saturated liquid refrigerant

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Aluminium
Lead
Iron
Rubber

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Refrigeration and Air Conditioning
Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

Increase
Reduce
None of these
Equalize

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Refrigeration and Air Conditioning
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

3
43833
43834
4

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Refrigeration and Air Conditioning
In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

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

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