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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

1/D
D2
D0.5
D

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Mass Transfer
The relative saturation of an unsaturated mixture of gas and vapor is independent of the

None of these
Nature of the vapor
Temperature of the mixture
Composition of the mixture

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Mass Transfer
Extraction of coffee from its seed is done by

Extractive distillation
Leaching
Liquid-liquid extraction
Steam distillation

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Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Small cross-section column
Less number of trays
High reflux ratio
Low reflux ratio

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Mass Transfer
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Decreases
Remains same
Increases
Either A or B; depends on the gas

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Erosion of the tower
Increased relative volatility
Thermal decomposition of bottoms
Very efficient operation

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