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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Gas liquefaction
Commercial refrigerators
Domestic refrigerators
Air conditioning

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Operating the machine at higher speeds
Lowering the higher temperature
Operating the machine at lower speeds
Raising the higher temperature

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Refrigeration and Air Conditioning
The coefficient of performance of Heat Pump is always ___ one.

None of the listed here
Greater than
Less than
Equal to

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

Lowers compressor capacity because vapour is lighter
Increases power required per ton of refrigeration
Lowers evaporation temperature
All of these

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

-107.7°C
-86.6°C
-95.2°C
-135.8°C

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Refrigeration and Air Conditioning
A bootstrap air cooling system has

Three heat exchangers
Two heat exchangers
Four heat exchangers
One heat exchanger

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MORE MCQ ON Refrigeration and Air Conditioning

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