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Mass Transfer

Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

99
90
95
91.5

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Mass Transfer
Lewis number (Le) is

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

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

0 and ≈ 1
1 and 0
< 1 and ≈ 1
>1 and ≈ 1

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(4De/πt)1/2
(De/t)1/2
(4De/t)
(De.t)1/2

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Mass Transfer
The solvent used in liquid-liquid extraction should have __________ less than one.

Both A & B
Selectivity
Neither A nor B
Distribution co-efficient

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Mass Transfer
The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.

Perfectly mixed
None of the listed here
Plug
Both plug & perfectly mixed

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