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Mass Transfer

Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ √D
K ∝ D
K ∝ D1.5
K ∝ D2

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Mass Transfer
During the constant rate period of drying of a solid,

Surface evaporation of unbound moisture occurs
Increasing the air temperature decreases the drying rate
Increased air humidity decreases the rate of drying
None of these

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Mass Transfer
On addition of solute in the solvent, the __________ of the solution decreases.

Boiling point
Freezing point
Vapour pressure
Both B and C

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Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

All of these
Gas phase
Liquid phase
Interface

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Mass Transfer
Extraction of coffee from its seed is done by

Extractive distillation
Leaching
Steam distillation
Liquid-liquid extraction

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Mass Transfer
Desirable value of absorption factor in an absorber is

0.5
1
< 1
> 1

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