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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

7
70
0.7
150

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Mass Transfer
What is the reflux ratio at total reflux?

Infinity
Zero
Data insufficient
Unity

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Mass Transfer
The temperature of water cooled in cooling tower is always __________ temperature of entering air.

Less than the wet bulb
More than the wet bulb
Equal to the wet bulb
Equal to the dry bulb

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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
Dependent on the Reynolds number
D/a
D/2a

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Mass Transfer
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

Both A & B
Neither A nor B
Raising the temperature
Lowering the total pressure

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Mass Transfer
__________ developed the film theory.

Higbie
Levenspeil
Fick
Ergun

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