Mass Transfer
For which of the following unit operations, Lewis number is of significance?

Binary distillation
Gas absorption
Humidification
Adsorption

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Lewis number is close to unity
Water has a high latent heat of evaporation
They are always equal under all circumstances
Solubility of the components of air in water is very small

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Total cost first decreases and then increases
Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases
Liquid flow increases while the vapor flow decreases for a system

ANSWER DOWNLOAD EXAMIANS APP