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Mass Transfer

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

K ∝ D1.5
K ∝ D2
K ∝ D
K ∝ √D

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Mass Transfer
Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their

Density
Relative volatility
Solubility
Viscosity

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Mass Transfer
Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.

Wet-bulb
Adiabatic saturation
Dew point
Dry-bulb

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P >>P
P
P < P
P = P

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Mass Transfer
In extractive distillation, solvent is

Present in overhead stream
Of high volatility
Added to alter the relative volatility of the mixture
Of high viscosity to give high tray efficiency

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

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

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