Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit).
a. Straight
b. Parallel
c. Both (A) & (B)
d. Neither (A) nor (B)
Q. Make up water is required in a cooling tower to replace the water lost by
a. Evaporation
b. Drift
c. Blowdown and leakage
d. All (A), (B) and (C)
Q. Langmuir equation is associated with
a. Leaching
b. Adsorption
c. Steam distillation
d. Multi-component absorption
Q. A packed tower compared to a plate tower for a particular mass transfer operation
a. Incurs smaller pressure drop
b. Allows installation of cooling coils
c. Is less costly when built in large sizes/diameters
d. Is more suitable, if suspended solids are present in fluid streams
Q. Which of the following is an undesirable property for an absorbing solvent?
a. Low vapour pressure
b. Low velocity
c. Low freezing point
d. None of these
Q. Stacked packing compared to dumped packing
a. Provides poorer contact between the fluids
b. Gives lower pressure drop
c. Both (A) and (B)
d. Gives higher pressure drop
Q. Raoult's law applies to the
a. All liquid solutions
b. Non-ideal solution only
c. Non-volatile solute
d. Solvents
Q. Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.
a. Agitated vessel
b. Sieve tray column
c. Bubble cap column
d. Packed tower
Q. Pick out the correct statement.
a. Diffusivity decreases with increase in temperature
b. Diffusivity increases with increase in molecular weight
c. Diffusivity increases with the size of the individual molecule
d. None of these
Q. Fenske equation determines the
a. Maximum number of ideal plates
b. Height of the distillation column
c. Minimum number of theoretical plates
d. Optimum reflux ratio
Q. If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively
a. [xD/(RD + 1)], [RD/(RD + 1)]
b. [RD/(RD + 1)], [xD/(xD + 1)]
c. [xD/(RD + 1)], [(RD + 1)/RD]
d. None of these
Q. Which of the following equipments is not used for gas dispersion?
a. Agitated vessels
b. Bubble cap tray towers
c. Perforated sieve tray towers
d. Spray towers
Q. __________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.
a. Wetted wall
b. Packed
c. Plate
d. Spray
Q. When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.
a. Always lower than
b. Always higher than
c. Same as
d. Dependent on the system; can be either lower or higher than