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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Accumulators should have adequate volume to store refrigerant charge at least

0.75
0.25
0.1
0.5

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Refrigeration and Air Conditioning
The desirable property of a refrigerant is

All of these
High critical temperature
High latent heat of vaporisation
Low boiling point

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Refrigeration and Air Conditioning
Refrigeration in aeroplanes usually employs the following refrigerant

Freon-11
Air
Freon-22
CO2

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Refrigeration and Air Conditioning
The humidity ratio or specific humidity is the mass of water vapour present in

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

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Refrigeration and Air Conditioning
Most air cooled condensers are designed to operate with a temperature difference of

22°C
8°C
5°C
14°C

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = μ cp/k
NN = hl/k
NN = ρ V l /μ
NN = V²/t.cp

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MORE MCQ ON Refrigeration and Air Conditioning

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