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Mass Transfer

Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

> 1
0.01
10-5 to 10-6
0.1

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Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

-1.5
0.6
-0.6
1.5

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Mass Transfer
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is

S < 1
S = ∞
S = 1
S > 1

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Mass Transfer
Operating velocity in a packed tower is usually __________ the flooding velocity.

Half
More than
Equal to
Twice

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ √D
K ∝ D1.5
K ∝ D
K ∝ D2

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.83
Re0.53
Re
Re0.33

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