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

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Mass Transfer
Critical humidity of a solid salt means the humidity

Above which it will always become damp
Below which it will always stay dry
Both A and B
Above Which it will always become dry and below which it will always stay damp

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Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

1.94
0.54
1.04
1.24

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Mass Transfer
______ extractor uses centrifugal force for separating the two phases.

None of the listed here
Treybal
Podbielniak
Schiebel

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Mass Transfer
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.

Decreases
Exponentially increases
Increases
Does not affect

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Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Less than that computed for ideality
None of these
Greater than that computed for ideality
Less than the sum of the vapour pressure of the components

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