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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

0.5
0.25
0.8
1.25

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Refrigeration and Air Conditioning
For obtaining high COP, the pressure range of compressor should be

Optimum
Any value
High
Low

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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 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
An Electrolux refrigerator is called a ___ absorption system.

Two fluids
Single fluid
Three fluids
None of the listed here

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Refrigeration and Air Conditioning
Ammonia absorption refrigeration cycle requires

Zero work input
Nearly same work input as for vapour compression cycle
Maximum work input
Very little work input

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