Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. In which of the following unit operations, the selectivity is an important parameter?
a. Distillation
b. Solvent extraction
c. Absorption
d. None of these
Q. Flash distillation is suitable for separating the constituents of a binary system, which
a. Form minimum boiling azeotrope
b. Have very wide boiling points
c. Have very close boiling points
d. Form constant boiling azeotrope
Q. In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.
a. Lower than
b. Higher than
c. Equal to
d. Either (A) or (B), depends on the mixture composition
Q. At __________ reflux, theoretical number of plates in a distillation coloumn is calculatedusing Fenske-Underwood equation.
a. Operating
b. Total
c. Minimum
d. Maximum permissible
Q. Pick out the correct statement.
a. The slope of the stripping line is always less than unity
b. For a given separation in a binary distillation column, with increase in reflux ratio (above the minimum reflux ratio), the fixed cost of the distillation column first increases and then decreases
c. In Ponchon-Savarit method of no. of theoretical plate determination, the stripping and rectifying operating lines are vertical at total reflux
d. Kremser-Brown-Souder's equation is used to calculate the efficiency of a plate tower
Q. In physical terms, Schmidt number means
a. Thermal diffusivity/mass diffusivity
b. Thermal diffusivity/momentum diffusivity
c. Momentum diffusivity/mass diffusivity
d. Mass diffusivity/thermal diffusivity
Q. Unit operation involved in the prilling of urea is
a. Evaporation
b. Drying
c. Crystallisation
d. Both (B) and (C)
Q. With increase in temperature, the solubility of gases in liquids, at fixed pressure
a. Increases
b. Decreases
c. Remain same
d. Either (A) or (B), depends on the system
Q. The equipment used in the extraction of highly corrosive radioactive liquids is
a. Pulse column
b. Spray column
c. Mixer settler
d. Baffle tower
Q. When the solvent dissolves very little of solute, then
a. Solvent of low latent heat of vaporisation should be used
b. Solvent of low freezing point should be used
c. Large quantity of solvent is required to extract the solute
d. Very small quantity of solvent is required
Q. Bollman extractor
a. Is a static bed leaching equipment
b. Is used for extraction of oil from oilseed
c. Is a centrifugal extractor
d. Employs only counter-current extraction
Q. In case of absorption, both the operating and equilibrium lines will be straight for
a. Isothermal operation
b. Dilute solutions
c. Dilute solutions and isothermal operation
d. None of these