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Mass Transfer

Mass Transfer
Free flowing granular materials can be best dried in a __________ drier.

Rotary
Drun
Cylinder
Freeze

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Mass Transfer
If the amount of the steam used in steam distillation is increased, the temperature of distillation

Increases
Remains unchanged
Decreases
Depends on relative volatility

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Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

Absorption
Solvent extraction
None of these
Distillation

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Mass Transfer
Lewis number (Le) is

St x Sh
Sh x Pr
Sc x Pr
Pr x St

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Mass Transfer
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

Zero
Equal to the heat of formation of surface compound
Called integral heat of adsorption
Equal to the heat of wetting

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Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Increases
Decreases
And the heat required in reboiler decreases
Remains unaffected

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