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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?

Ammonia
Sulphur dioxide
Carbon dioxide
Fluorine

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Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Suction of compressor
High pressure side close to receiver
Delivery of compressor
Low pressure side near receiver

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Refrigeration and Air Conditioning
The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called

Refrigerating efficiency
Coefficient of performance of heat pump
Relative coefficient of performance
Coefficient of performance of refrigeration

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-33.3°C
-77.7°C
-30°C
-10.5°C

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Refrigeration and Air Conditioning
In a refrigeration system, heat absorbed in comparison to heat rejected is

Same
More
More for small capacity and less for high capacity
Less

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is ________ dew point temperature.

None of these
Lower than
Same as
Higher than

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