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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)

D2
D0.5
1/D
D

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Mass Transfer
Sand is dried in foundaries in a___drier.

Rotary
Vacuum
Fluidisedbed
Spray

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

1
10
100
5

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Mass Transfer
Flash distillation is suitable for the separation of components

Having very close boiling points
Which form minimum boiling azeotrope
Which form maximum boiling azeotrope
Having very wide boiling points

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Mass Transfer
In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.

Either A, or B ; depends on the type of packing
Equal to
Smaller than
Greater than

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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
D/a
Dependent on the Reynolds number

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