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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

43834
43833
4
3

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Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Isentropic expansion process
Constant pressure cooling process
Constant pressure expansion process
Isentropic compression process

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Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

None of these
Remains constant
Increases
Decreases

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

very little power consumption
quiet operation
cooling below 0°C
noisy operation

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Refrigeration and Air Conditioning
Which of the following refrigerant is highly toxic and flammable?

R-12
Sulphur dioxide
Carbon dioxide
Ammonia

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It is miscible with oil over large range of temperatures
It gives higher coefficient of performance
All of these
It has low operating pressures

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