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Refrigeration and Air Conditioning

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

Decreases
None of these
Remains constant
Increases

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

Humidification
Dehumidification
Heating and humidification
Cooling and dehumidification

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

R-22
Ammonia
R-12
R-11

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Refrigeration and Air Conditioning
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Metering of the refrigerant liquid
Condensation of the refrigerant vapour
Compression of the refrigerant vapour
Evaporation of the refrigerant liquid

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

8 bar
15 bar
30 bar
2 bar

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Refrigeration and Air Conditioning
The vapour pressure of refrigerant should be

Equal to atmospheric pressure
Could be anything
Lower than atmospheric pressure
Higher than atmospheric pressure

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