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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

D0.5
D
1/D
D2

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Mass Transfer
Desulphurisation of petrol is done in a

Rotating disc extractor
Plate type extraction column
Bollman extractor
Packed extraction column

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Mass Transfer
The cooling effect in a cooling tower can be speeded up by

All of the listed here
Reducing the barometric pressure
Reducing the humidity of the air
Increasing the air velocity and area of exposed wet surface

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Mass Transfer
Only small amount of evaporation of water produces large cooling effects because of its

Low viscosity
Large latent heat
None of these
Small latent heat

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Mass Transfer
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.

None of the listed here
Penetration
Surface renewal
Film

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Mass Transfer
As the reflux ratio decreases, the

Number of plates increases
None of these
Column diameter increases
Separation becomes more efficient

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