Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. The critical moisture content in case of drying indicates the __________ rate period.
a. Beginning of falling
b. Beginning of constant
c. End of falling
d. None of these
Q. Pick out the wrong statement.
a. The binary diffusivity in liquids is of the order of 10-5 cm2 /sec
b. Molecular diffusion in solid is much faster than that in liquids
c. Particles movement from higher concentration to lower concentration takes place in diffusion process
d. According to Poiseuille's law, the permeability decreases with increase in temperature for flow of a gas through a given capillary
Q. Separation of two volatile liquids by distillation makes use of their
a. Selectivity
b. Relative volatility
c. Solubility
d. Density difference
Q. Powdery materials can be guarded against caking tendency on storage by
a. Providing irregular grain size
b. Providing minimum percentage of voids
c. Having maximum possible points of contact
d. None of these
Q. The minimum liquid rate to be used in an absorber corresponds to an operating line
a. Of slope = 1
b. Of slope = 0.1
c. Tangential to the equilibrium curve
d. None of these
Q. Leaching of uranium ore and gold ore is done in
a. Centrifugal extractor
b. Pachuca tanks
c. Bollman extractor
d. None of these
Q. For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.
a. Binary mixture is represented by the apex
b. Binary mixture is represented by any point inside
c. Ternary mixture is represented by the sides
d. Pure component is represented by the apex
Q. In a gas-liquid absorption column, for obtaining the maximum absorption efficiency
a. Liquid stream should be distributed uniformly
b. Gas stream should be distributed uniformly
c. Both gas as well as liquid streams should be distributed uniformly
d. By passing should be completely avoided
Q. To get high tray efficiency
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
Q. Which is not concerned directly with mass transfer?
a. Schmidt number
b. Sherwood number
c. Lewis relationship
d. Froude number
Q. Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.
a. Size
b. Durability
c. Porosity
d. Cost
Q. For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.
a. No change in theoretical
b. Marginal decrease in the number of
c. Major decrease in the number of
d. None of these
Q. Experimental determination of __________ is done by wetted wall column method.
a. Diffusion co-efficient
b. Mass transfer co-efficient
c. NTU
d. None of these