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Mass Transfer

Mass Transfer
Desirable value of absorption factor in an absorber is

> 1
1
0.5
< 1

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Mass Transfer
Molecular diffusivity of a liquid

May increase or decrease with temperature
Increases with temperature
Decreases with temperature
Is independent of temperature

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(4De/πt)1/2
(De/t)1/2
(4De/t)
(De.t)1/2

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

Pachuka tanks
Centrifugal extractor
None of these
Bollman extractor

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Mass Transfer
The caking of crystals can be prevented by

Coating the product with inert material
Maintaining low critical humidity
Maintaining high critical humidity
Both A and C

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Mass Transfer
Drying operation under vacuum is carried out to

Increase drying temperature
Reduce drying temperature
Dry those materials which have very high unbound mositure content
Dry materials having high bound moisture content

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