Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. Can the efficiency of a plate in the distillation tower be greater than 100%?
a. Yes
b. Normally not; but is possible if infinite number of plates are put
c. Never
d. Yes; if the reflux ratio is maximum
Q. H2S present in naphtha reformed gas is removed by absorbing with
a. Ethanolamine
b. K2CO3
c. HCl
d. Vacuum gas oil
Q. Dorr thickener is an equipment used for
a. Classification
b. Sedimentation
c. Clarification
d. Leaching
Q. With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent
a. Increases
b. Decreases
c. Remain same
d. Either (A) or (B), depends on the system
Q. Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.
a. Film
b. Penetration
c. Surface-renewal
d. None of these
Q. __________ extractor uses centrifugal force for separating the two phases.
a. Treybal
b. Scheibel
c. Podbielniak
d. None of these
Q. With increase in temperature, the mutual solubility of two liquids
a. Increases
b. Decreases
c. Remains unchanged
d. Decreases exponentially
Q. The operating cost of a distillation column at minimum reflux ratio is
a. Minimum
b. Maximum
c. Infinite
d. Zero
Q. For a single component absorber, the operating line is straight only when plotted in term of __________ units.
a. Partial pressure
b. Mole ratio
c. Mole fraction
d. None of these
Q. The cooling effect in a cooling tower cannot be increased by
a. Increasing the air velocity over the wet surfaces
b. Reducing the humidity of entering air
c. Lowering the barometric pressure
d. None of these
Q. Separation of __________ employs gaseous diffusion process.
a. N2 and O2 from air
b. Isotopes of uranium
c. Isotopes of helium
d. SO2 and air
Q. Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.
a. Plate
b. Baffle
c. Packed
d. None of these
Q. Leaching rate is independent of the
a. Agitation
b. Temperature
c. Particle size
d. None of these
Q. With increase in temperature, the rate of leaching increases, because the
a. Diffusivity of solute increases
b. Viscosity of solvent decreases
c. Thermal conductivity of solute increases
d. None of these