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Mass Transfer

Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
2.5
0.0025
1.25

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Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

None of these
Dehumidified
Humidified with wet bulb temperature decreasing
Humidified at constant wet bulb temperature

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Mass Transfer
Large scale usage of flash distillation is practised in

Polymerisation industry
Petroleum refinning
Soap manufacturing
Ammonia synthesis plant

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Mass Transfer
The-relative volatility for separation of a non-ideal binary mixture by distillation should be

1
> 1
< 1

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Mass Transfer
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

T²
√T
T
1/T

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Mass Transfer
Stacked packing compared to dumped packing

Provides poorer contact between the fluids
Gives lower pressure drop
Both A & B
Gives higher pressure drop

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