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Mass Transfer

Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

600
1
3.97
0.24

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

< 1 and ≈ 1
1 and 0
0 and ≈ 1
>1 and ≈ 1

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Mass Transfer
Minimum possible diameter of a packed coloumn is decided mainly by the

Flooding
Liquid hold up
Gas viscosity
Liquid density

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Mass Transfer
The commonly used solvent in supercritical extraction is

Methyl ethyl ketone
Carbon tetrachloride
Carbon dioxide
Water

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Mass Transfer
Critical humidity of a solid salt means the humidity

Above Which it will always become dry and below which it will always stay damp
Both A and B
Above which it will always become damp
Below which it will always stay dry

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Mass Transfer
If the amount of the steam used in steam distillation is increased, the temperature of distillation

Depends on relative volatility
Remains unchanged
Decreases
Increases

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MORE MCQ ON Mass Transfer

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