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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

> 10
1
5 to 10
1 to 5

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Mass Transfer
The expression, y(1 - x)/x(1 - y) is for

Selectivity
Murphree efficiency
Absorption factor
Relative volatility

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Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Maximum permissible
Operating
Total
Minimum

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Mass Transfer
As per Gilliland's equation, the diffusivity is

Dependent on the molecular volume & molecular weight of components
All of these
Inversely proportional to 'P'
Directly proportional to 'T1.5'

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Mass Transfer
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

√T
T3
T1.5
T

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Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Vacuum
Falling film
Long tube
Short tube

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