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Mass Transfer

Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Higbie
Kissinevskii
Toor and Marchello
Danckwerts

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Mass Transfer
Pick out the system with maximum boiling azeotrope at 1 atm.

Acetone chloroform
Ethyl alcohol-water
Benzene-ethyl alcohol
None of these

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Does not change with time
Increases with time
Does not affect the moisture content of the wet solid
Decreases with time

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Mass Transfer
Molecular seives are porous

None of these
Alumina
Silica
Synthetic zeolites crystals/metal alumino-silicates

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Mass Transfer
Prandtl number for water at 20°C is about

150
70
7
0.7

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Mass Transfer
In a binary system, separation is very efficient, when the relative volatility is

0.5
< 1
> 1
1

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