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Mass Transfer

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Surface renewal
Film
Penetration
None of these

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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
Leaching of coarse solid lumps is also termed as

Agitation and settling
Decoction
Percolation
Dissolution

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Mass Transfer
For a binary mixture with low relative volatility,

Use steam distillation
An azeotrope may be formed during distillation
Use molecular distillation
Use high pressure distillation

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Mass Transfer
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is

S = 1
S = ∞
S > 1
S < 1

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Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Interface
Liquid phase
Gas phase
All of these

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