Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Saturated steam is used for steam distillation
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Total pressure is less
Temperature is less

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Flash distillation is

Same as simple distillation
Used for multicomponent systems like crude refining
Same as differential distillation
Most useful for handling binary systems

ANSWER DOWNLOAD EXAMIANS APP