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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.

None of these
Lower
Higher
Same

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Refrigeration and Air Conditioning
In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

Cooled and humidified
Heated and humidified
Heated and dehumidified
Cooled and dehumidified

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Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

0.2
1.2
6
5

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

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

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

1
2.15
5.12
1.25

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Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-22
Ammonia
R-11
R-12

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