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Mass Transfer

Mass Transfer
Paper industry employs __________ driers.

Fluidised bed
Rotary
Spray
Cylinder

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Mass Transfer
Stacked packing compared to dumped packing

Gives higher pressure drop
Both A & B
Gives lower pressure drop
Provides poorer contact between the fluids

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Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

0.01
0.1
> 1
10-5 to 10-6

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Mass Transfer
The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

Both liquid and gas side
Interfacial
Gas side
Liquid side

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Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Falling film
Short tube
Long tube
Vacuum

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Mass Transfer
With increase in temperature, the leaching rate increases due to

Both A & B
Neither A nor B
Decreased liquid viscosity
Increased diffusivity

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