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Mass Transfer

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

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

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Mass Transfer
The Hatta number is important in

Gas absorption with chemical reaction
Binary distillation
Gas absorption without chemical reaction
Multicomponent distillation

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Mass Transfer
The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is

1
2
0.5
∞

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Mass Transfer
Which of the following adsorbant is used in the refinning of sugar?

Silica gel
Activated clay
Wood charcoal
Bone charcoal

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Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Never
Yes ; if the reflux ratio is maximum
Normally not; but is possible if infinite number of plates are put
Yes

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

15 min
71 min
51 min
94 min

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