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

Penetration
None of the listed here
Surface renewal
Film

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Mass Transfer
Inside the distillation column, the

None of these
Driving force for the vapour flow is the pressure drop
Liquids are not always at their bubble points
Pressure increases gradually from bottom to the top of the column

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Viscosity variation of the fluids may cause channeling/flooding
Pressure drop in the equipment will be very high
None of these

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