Category: Mass Transfer

A. In solvent extraction, the distribution co-efficient should be as large as possible for solvent
economy
B. With increase in pressure, the solubility of gases in solvent increases at a fixed temperature
C. Decrease in Murphree plate efficiency is an indication of entrainment in distillation column
D. The capacity of a distillation column is maximum at total reflux

A. Use steam distillation
B. Use molecular distillation
C. Use high pressure distillation
D. An azeotrope may be formed during distillation

A. Reducing the total pressure
B. Increasing the total pressure
C. Reducing the temperature
D. Both B. and C.

A. Interfacial surface between liquid and gas phase should be large
B. Time of contact between the two phases should be less
C. Gas velocity should be very low
D. Liquid entrainment should be severe

A. D
B. D2
C. D0.5
D. 1/D

A. Driving force for the vapour flow is the pressure drop
B. Liquids are not always at their bubble points
C. Pressure increases gradually from bottom to the top of the column
D. None of these

A. Dew point
B. Bubble point
C. Dry bulb temperature
D. Wet bulb temperature

A. Long tube
B. Short tube
C. Vacuum
D. Falling film

A. Reflux ratio
B. Plate efficiency to be achieved
C. Thermal condition of the feed
D. Relative volatility

A. Temperature rises
B. Pressure rises
C. Temperature falls
D. Pressure falls