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

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

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Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
None of these
Actual humidity to saturation humidity

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