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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

3.33
2.33
4.33
1.33

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Refrigeration and Air Conditioning
The wet bulb temperature during sensible heating of air

None of these
Increases
Remains constant
Decreases

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid

After passing through the condenser
Before entering the expansion valve
After passing through the expansion or throttle valve
Before passing through the condenser

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Refrigeration and Air Conditioning
For unsaturated air, the dew point temperature is __________ wet bulb temperature.

None of these
Equal to
More than
Less than

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Refrigeration and Air Conditioning
Absorption system normally uses the following refrigerant

Freon-11
Ammonia
CO2
Freon-22

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Refrigeration and Air Conditioning
During humidification process, __________ increases.

Specific humidity
Dry bulb temperature
Wet bulb temperature
Relative humidity

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