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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1 to 5
5 to 10
1
> 10

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Mass Transfer
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is

0.5
1
2
∞

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Mass Transfer
Stefan's law describes the mass transfer by

Diffusion
Both A & B
Bulk flow
Neither A nor B

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Mass Transfer
Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be

Both A & B
Dehumidified
Humidified
Cooled

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

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

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

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

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