Mass Transfer

Mass Transfer

Flooding in a distillation column is detected by a sharp ___________________?

Flooding in a distillation column is detected by a sharp ___________________?

A. Increase in Murphree plate efficiency
B. Decrease in pressure drop
C. Decrease in liquid hold up in the column
D. Increase in pressure drop

Read More Flooding in a distillation column is detected by a sharp ___________________?
Mass Transfer

Which of the following operations does not involve leaching ?

Which of the following operations does not involve leaching ?

A. Dissolving gold from ores
B. Dissolving pharmaceutical products from bark or roots
C. Dissolving sugar from the cells of the beet
D. Removing nicotine from its water solution by kerosene

Read More Which of the following operations does not involve leaching ?
Mass Transfer

Diameter to height ratio for a raschig ring is_____________________?

Diameter to height ratio for a raschig ring is_____________________?

A. 1
B. 0.5
C. 2
D. 8

Read More Diameter to height ratio for a raschig ring is_____________________?
Mass Transfer

With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency____________________?

With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency____________________?

A. Increases
B. Decreases
C. Remain same
D. May increase or decrease; depends on individual design

Read More With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency____________________?
Mass Transfer

For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is___________________?

For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is___________________?

A. Calculated
B. Unknown
C. Known
D. Not required

Read More For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is___________________?
Mass Transfer

Mass transfer co-efficient is directly proportional to DAB 0.5, according to ________________ theory ?

Mass transfer co-efficient is directly proportional to DAB 0.5, according to ________________ theory ?

A. Penetration
B. Surface renewal
C. Film
D. None of these

Read More Mass transfer co-efficient is directly proportional to DAB 0.5, according to ________________ theory ?
Mass Transfer

Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?

Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?

A. Grid tray tower
B. Perforated tray tower
C. Wetted wall tower
D. Bubble cap tower

Read More Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?
Mass Transfer

Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?

Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?

A. 25%
B. 50%
C. 70%
D. 90%

Read More Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?
Mass Transfer

According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?

According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?

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

Read More According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?
Mass Transfer

For a distillation column operating at minimum reflux, the_______________________?

For a distillation column operating at minimum reflux, the_______________________?

A. Concentration of liquid and vapour leaving a plate will be same
B. Reflux ratio will be maximum
C. Number of plates required will be maximum
D. None of these

Read More For a distillation column operating at minimum reflux, the_______________________?