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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

0.25
1.25
0.8
0.5

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Refrigeration and Air Conditioning
The mass of water vapour present in __________ is called absolute humidity.

1 m3 of water
1 m3 of dry air
1 kg of wet air
1 kg of dry air

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Refrigeration and Air Conditioning
The minimum temperature to which water can be cooled in a cooling tower is

Wet bulb temperature of air
Dew point temperature of air
Ambient air temperature
Dry bulb temperature of air

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

Freon-12
CO2
NH3
Freon-22

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Refrigeration and Air Conditioning
The superheating in a refrigeration cycle

Decreases C.O.P.
Does not alter C.O.P.
Increases C.O.P.
None of these

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Refrigeration and Air Conditioning
The freezing point of sulphur dioxide is

-56.6°C
-135.8°C
-75.2°C
-77.7°C

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