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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m²/hK
m/hK
m/h

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Refrigeration and Air Conditioning
The value of C.O.P in vapour compression cycle is usually

Always less than unity
Always more than unity
Any one of the above
Equal to unity

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Refrigeration and Air Conditioning
The lowest temperature during the cycle in a vapour compression system occurs after

Condensation
Compression
Expansion
Evaporation

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Refrigeration and Air Conditioning
The superheating in a refrigeration cycle

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

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It requires large displacement per TR compared to fluoro carbons.
All of these
It is toxic to mucous membranes.
It reacts with copper and its alloys.

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Refrigeration and Air Conditioning
Cooling water is required for following equipment in ammonia absorption plant

Condenser
Evaporator
Absorber
Condenser, absorber and separator (rectifier)

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