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Refrigeration and Air Conditioning

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

R-11
R-12
Ammonia
R-22

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Refrigeration and Air Conditioning
The vapour pressure of refrigerant should be

Lower than atmospheric pressure
Could be anything
Higher than atmospheric pressure
Equal to atmospheric pressure

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

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Refrigeration and Air Conditioning
A bootstrap air cooling system has

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

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Refrigeration and Air Conditioning
Which of the following refrigerant has the lowest freezing point?

Ammonia
R-11
R-22
R-12

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Refrigeration and Air Conditioning
In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be

1.5
0.6
0.67
0.3

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