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Refrigeration and Air Conditioning

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

Remains constant
Decreases
Increases
None of these

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Refrigeration and Air Conditioning
The process, generally used in winter air-conditioning to warm and humidity the air, is called

Dehumidification
Heating and humidification
Humidification
Cooling and dehumidification

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Refrigeration and Air Conditioning
Air refrigerator works on

None of these
Bell Coleman cycle
Reversed Carnot cycle
Both (A) and (B)

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-135.8°C
-107.7°C
-86.6°C
-95.2°C

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Carbon dioxide
Freon
Ammonia
Brine

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

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

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