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Refrigeration and Air Conditioning

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

Decreases
Remains constant
None of these
Increases

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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
The humidity ratio or specific humidity is the mass of water vapour present in

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

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

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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?

0.5
0.25
0.8
1.25

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