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Mass Transfer

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

600
0.24
3.97
1

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Mass Transfer
Stage efficiency in a leaching process depends on the

Vapour pressure of the solution
Both A & B
Time of contact between the solid and the solution
Rate of diffusion of the solute through the solid and into the liquid

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Mass Transfer
The vapour pressure exerted by the moisture contained in a wet solid depends upon the

Temperature
Nature of the solid
All of these
Nature of the moisture

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Mass diffusivity to momentum diffusivity
None of these
Momentum diffusivity to thermal diffusivity
Thermal diffusivity to mass diffusivity

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

Decreases
Remains unchanged
Depends on relative volatility
Increases

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Mass Transfer
The minimum number of theoretical plates is required for achieving a given separation in distillation column with

Total reflux
No reflux
Minimum reflux ratio
Zero reflux ratio

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