Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

> 8:1
< 6:1
> 4 :1
< 8 : 1

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components has very high affinity towards the solvent
Viscosity of liquid components is very high
One of the liquid components is heat sensitive
Extracting solvent is cheaply & abundantly available

ANSWER DOWNLOAD EXAMIANS APP