Mass Transfer
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Either A or B; depends on the gas
Decreases
Increases
Remains same

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
In a counter-current liquid extractor

Both liquids flow at fixed rate
Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids can have any desired flow rate

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Steam distillation is not recommended to be used, if the

Azeotropic mixture is to be separated and the final product is miscible with water
Liquids decompose, if distilled directly at atmospheric pressure
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
The rate of solid-liquid extraction is limited by the

All of these
Phase change of the solute as it dissolves in the solvent
Diffusion of the solute through the solvent in the pores to the outside of the particle
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Rotary dryer is suitable for drying sticky material
Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%
Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Mass Transfer