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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1
1 to 5
> 10
5 to 10

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Mass Transfer
According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)

μ
μ²
1/μ
√μ

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Mass Transfer
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

Constant relative volatility
All of these
Total reflux
Constant molal overflow

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Mass Transfer
The most common packing used in industrial operations is __________ rings.

Single spiral
Cross-partition
Lessing
Raschig

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Mass Transfer
Stacked packing compared to dumped packing

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

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Mass Transfer
__________ developed the film theory.

Higbie
Levenspeil
Fick
Ergun

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