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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Gas liquefaction
Domestic refrigerators
Commercial refrigerators
Air conditioning

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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 has low operating pressures
All of these
It gives higher coefficient of performance

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Refrigeration and Air Conditioning
For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is

Zero
100
20
50

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Refrigeration and Air Conditioning
During sensible cooling,

Partial pressure of vapour remains constant
Relative humidity remains constant
Specific humidity increases
Wet bulb temperature increases

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Rubber
Lead
Aluminium
Iron

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Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1: 9
1: 3
1: 1
9: 1

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MORE MCQ ON Refrigeration and Air Conditioning

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