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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Most thermostatic expansion valves are set for a superheat of

15°C
20°C
5°C
10°C

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Refrigeration and Air Conditioning
Rating of a domestic refrigerator is of the order of

5 tons
10 tons
0.1 ton
40 tons

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Refrigeration and Air Conditioning
The relative coefficient of performance is

None of these
Theoretical COP/actual COP
Actual COP × theoretical COP
Actual COP/theoretical COP

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Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

decreases
remains same
depends on other factors
increases

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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?

0.25
0.8
0.5
1.25

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Refrigeration and Air Conditioning
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be

Zero
High, of the order of 25°
As low as possible (3 to 11°C)
Any value

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