Mass Transfer
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

Increases
May increase or decrease ; depends on individual design
Decreases
Remains same

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Pr = Sc ; there won
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
Both A & B
Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same

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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

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

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