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Mass Transfer

Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

91.5
99
90
95

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Mass Transfer
For the same process conditions, the reflux ratio of an unlagged distillation column

Decreases in winter
Increases in winter
None of these
Increases in summer

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Mass Transfer
The percentage humidity is less than the relative humidity only at __________ percent humidity.

Hundred
Both zero and hundred
None of these
Zero

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

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

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Mass Transfer
Back-trapping in a distillation column

Reduces pressure drop
Increases tray efficiency
Is desirable, as it provides improved vapour-liquid contact
Decreases tray efficiency

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Mass Transfer
The process employing desorption of the absorbed solute by a solvent is called

Osmosis
Elution
Reverse osmosis
Sublimation

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