Mass Transfer
Flights in a rotary dryer are provided to

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

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Channelling is most severe

In dumped packing of regular units
At very high liquid flow rate
In towers packed with stacked packing
In towers packed randomly with crushed solids

ANSWER DOWNLOAD EXAMIANS APP