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Mass Transfer

Mass Transfer
Which is the controlling factor for a drum drier?

Neither A nor B
Both A & B
Heat transfer
Diffusion

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

> 1
< 1
1

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Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

McCabe-Thiele method
Plate absorption column
Ponchan-Savarit method
Enthalpy concentration method

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Mass Transfer
Danckwerts developed the __________ theory.

Film
Surface renewal
Penetration
None of these

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Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Small cross-section column
High reflux ratio
Low reflux ratio
Less number of trays

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Mass Transfer
Freundlich equation applies to the adsorption of solute from

Concentrated solutions
Dilute solutions, over a small concentration range
None of these
Gaseous solutions at high pressure

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