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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

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

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Mass Transfer
Leaching of uranium ore and gold ore is done in

None of these
Bollman extractor
Pachuka tanks
Centrifugal extractor

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

High labour cost & low heat economy
All of the listed here
Non-uniform & low production rate
High maintenance cost

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/2a
Proportional to √D
Dependent on the Reynolds number
D/a

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Mass Transfer
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Range is 15°F
Approach is 10°F
Neither A nor B
Both A & B

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Mass Transfer
In case of constant underflow extraction operation, the __________ at all solute concentration.

Both A & B
Neither A nor B
Solids are drained to the same extent
Ratio of the insoluble to solution is constant

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