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Mass Transfer

Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ P0.5
D ∝ 1/P1.5
D ∝ 1/P0.5
D ∝ 1/P

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Mass Transfer
The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the

Integral heat of adsorption
Differential heat of adsorption
None of these
Heat of wetting

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Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

1/f
2f
F
F/2

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Mass Transfer
__________ developed the film theory.

Fick
Ergun
Levenspeil
Higbie

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Mass Transfer
During constant rate period, the rate of drying decreases with the

Both A & B
Decrease in air temperature
Neither A nor B
Increase in air humidity

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Mass Transfer
NSc/NPr is called the

Sherwood number
Stantan number
Lewis number
Psychrometric ratio

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