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Mass Transfer

Mass Transfer
__________ equation applies to diffusivities in liquids.

Gilliland
Wilke and Chang
None of these
Hirschfelder

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Mass Transfer
If moisture content of solid on dry basis is X, then the same on wet basis is

(X - 1)/X
X/(X - 1)
X/(X + 1)
(X + 1)/X

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T²
√T
T³
T

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Mass Transfer
Freundlich equation applies to the adsorption of solute from

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

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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 ∝ P0.5
D ∝ 1/P

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Mass Transfer
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)

P vs . log T
Log P vs . T
Log P vs. log T
T vs . P

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