Mass Transfer
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

> 25
-25
25
< 25

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Mass Transfer
Flights in a rotary dryer are provided to

Reduce the residence time of solid
None of these
Increase the residence time of the solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas

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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

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

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