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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The Freon group of refrigerants are

Inorganic refrigerants
Halocarbon refrigerants
Hydrocarbon refrigerants
Zoetrope refrigerants

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-86.6°C
-107.7°C
-95.2°C
-135.8°C

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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?

0.5
1.25
0.8
0.25

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Refrigeration and Air Conditioning
The superheated vapour region, in a pressure enthalpy chart, is represented by the space

To the left of saturated liquid line
None of these
To the right of saturated liquid line
Between the saturated liquid line and saturated vapour line

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Refrigeration and Air Conditioning
The COP of a domestic refrigerator

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

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It gives higher coefficient of performance
It has low operating pressures
It is miscible with oil over large range of temperatures
All of these

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