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Mass Transfer

Mass Transfer
Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as

D1.5
D
1/D
D0.5

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Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Critical
Bound
Unbound
Free

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Mass Transfer
If moisture content of solid on dry basis is X, then the same on wet basis is

(X - 1)/X
X/(X + 1)
X/(X - 1)
(X + 1)/X

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Mass Transfer
Which of the following is an undesirable property in a tower packing?

Large surface per unit volume
Large weight of liquid retained
Low weight per unit volume
Large free cross-section

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

0.01
> 1
0.1
10-5 to 10-6

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Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

-1
+ ve
- ve
1

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