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Mass Transfer

Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

10
0.01
0.1
1

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Mass Transfer
The unit of volumetric diffusivity is

Cm²/sec
Cm³/sec
Cm/sec
Cm²/seC₂

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Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Yes
Never
Normally not; but is possible if infinite number of plates are put
Yes ; if the reflux ratio is maximum

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

> 1
1
< 1

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Mass Transfer
The rate of mass transfer is not dependent upon the

Both A & B
None of these
Degree of dispersion of one fluid in the other
Interfacial surface exposed between the phases

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Mass Transfer
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

Not required
Known
Calculated
Unknown

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