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

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

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Mass Transfer
In the constant rate period of the rate of drying curve for batch drying,

Cracks develop on the surface of the solid
Surface evaporation of unbound moisture occurs
None of these
Rate of drying decreases abruptly

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Mass Transfer
Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as

D
D1.5
D0.5
1/D

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Mass Transfer
__________ column is used in gas absorption process.

Seive/perforated tray
Wetted wall
Packed
Bubble cap

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Mass Transfer
Critical humidity of a solid salt means the humidity

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

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