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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Domestic refrigerators
Air conditioning
Commercial refrigerators
Gas liquefaction

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Refrigeration and Air Conditioning
Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

None of these
Reduce
Increase
Equalize

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Refrigeration and Air Conditioning
The higher temperature in vapour compression cycle occurs at

Receiver
Expansion valve
Evaporator
Compressor discharge

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Refrigeration and Air Conditioning
The freezing point of sulphur dioxide is

-135.8°C
-75.2°C
-77.7°C
-56.6°C

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Refrigeration and Air Conditioning
The leakage in a refrigeration system using ammonia is detected by

Sulphur sticks
All of these
Halide torch
Soap and water

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

Will remain unaffected
Will be lower
Will be higher
May be higher or lower depending upon the nature of non-condensable gases

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