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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

1/D
D
D0.5
D2

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Mass Transfer
Steam distillation is used for separation of high boiling

Both of the options given here
none of the listed here
Substances from non-volatile impurities
Volatile impurity from still higher boiling substances

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Mass Transfer
Danckwerts developed the __________ theory.

Film
Surface renewal
Penetration
None of these

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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

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

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

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

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Mass Transfer
The rate of mass transfer is not dependent upon the

Both A & B
None of these
Degree of dispersion of one fluid in the other
Interfacial surface exposed between the phases

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