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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

Decreases
Increases
Remains constant
None of these

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Refrigeration and Air Conditioning
The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called

Dalton's law of partial pressures
Avogadro's hypothesis
Kinetic theory of gases
Newton's law of gases

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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
9: 1
1: 1

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Refrigeration and Air Conditioning
Wet bulb temperature is the temperature of air recorded by a thermometer, when

None of these
It is not affected by the moisture present in the air
The moisture present in it begins to condense
Its bulb is surrounded by a wet cloth exposed to the air

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Refrigeration and Air Conditioning
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

Cooled and humidified
Cooled and dehumidified
Heated and dehumidified
Heated and humidified

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Refrigeration and Air Conditioning
Which of the following refrigerant has the highest freezing point.

Carbon dioxide
Sulphur dioxide
R-12
Ammonia

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