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Mass Transfer

Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

- 1/f
(1 - f)/f
- (f - 1)/f
- f/(1 - f)

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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
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Either A or B; depends on the gas
Decreases
Increases
Remains same

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Mass Transfer
Minimum reflux ratio in a distillation column results in

Optimum number of trays
Maximum condenser size
Minimum number of trays
Minimum reboiler size

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

Surface renewal
Penetration
None of these
Film

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Mass Transfer
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Increased reboiler load
Greater degree of separation with a fixed number of trays
Increased reflux ratio
None of these

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