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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/P0.5
D ∝ P0.5
D ∝ 1/P1.5

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Mass Transfer
Rayleigh's equation applies to __________ distillation.

Steam
Differential
Flash
Continuous

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

8.89
8.25
6.89
10

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 + Re)
Ri = Re
Ri = Re/(1 - Re)
Ri = (1 - Re)/Re

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Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Rag paper
Anthracite coal
Bamboo
Inorganic solids

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Mass Transfer
The relative volatility of a binary mixture at constant temperature __________ the total pressure.

Is independent of
Increases with increase in
Decreases with increase in
None of these

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