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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/hK
m/hK
m/h
m²/h

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Refrigeration and Air Conditioning
The advantage of dry compression is that

It permits higher speeds to be used
It permits complete evaporation in the evaporator
All of these
It results in high volumetric and mechanical efficiency

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Refrigeration and Air Conditioning
The power per tonne of refrigeration is

3.5 × C.O.P.
O.P/3.5
None of these
3.5/C.O.P.

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Refrigeration and Air Conditioning
Absorption system normally uses the following refrigerant

Freon-11
CO2
Ammonia
Freon-22

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

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

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Refrigeration and Air Conditioning
The Freon group of refrigerants are

Hydrocarbon refrigerants
Halocarbon refrigerants
Inorganic refrigerants
Zoetrope refrigerants

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