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Mass Transfer

Mass Transfer
Danckwerts developed the __________ theory.

Film
Surface renewal
Penetration
None of these

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P1.5
D ∝ 1/P0.5
D ∝ 1/P
D ∝ P0.5

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Mass Transfer
Water entrained by circulating air in cooling towers is termed as

Drift
None of the listed here
Vapor load
Blow down

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Mass Transfer
L/mG is the expression for

Brinkman number
Slope of operating line in absorber
Absorption factor
Slope of operating line in stripper

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Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Maximum permissible
Operating
Total
Minimum

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Mass Transfer
Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?

Packed towers
Wetted wall columns
Plate towers
Spray towers

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