Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. Ammonia present in the coke oven gas is removed by washing with
a. Caustic solution
b. Dilute ammoniacal liquor
c. Dilute HCl
d. Ethanolamine
Q. Which of the following provides maximum contact surface for a liquid-vapour system?
a. Packed tower
b. Bubble-cap plate column
c. Sieve-plate column
d. Wetted wall column
Q. Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ column.
a. Spray
b. Packed
c. Bubble cap plate
d. Wetted wall
Q. Which of the following is directly concerned with Psychrometry?
a. Lewis relationship
b. Galileo number
c. Weber number
d. Dean number
Q. In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be
a. At ground level
b. 2 metres above the ground
c. 5 metres above ground
d. 10 metres above ground
Q. Which of the following is an undesirable property in a tower packing?
a. Large surface per unit volume
b. Large free cross-section
c. Low weight per unit volume
d. Large weight of liquid retained
Q. High pressure at the bottom of a distillation tower handling heat sensitive materials results in
a. Thermal decomposition of bottoms
b. Increased relative volatility
c. Erosion of the tower
d. Very efficient operation
Q. Steady state equimolal counter diffusion is encountered in
a. Separation of a binary mixture by distillation
b. Absorption of NH3 from air by water
c. All liquid-liquid diffusion systems
d. All liquid-solid diffusion systems
Q. Minimum reflux ratio in a distillation column results in
a. Optimum number of trays
b. Minimum reboiler size
c. Maximum condenser size
d. Minimum number of trays
Q. In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of
a. 1.5
b. -0.6
c. -1.5
d. 0.6
Q. The individual mass transfer co-efficients (moles/m2 s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling?
a. Liquid side
b. Gas side
c. Interfacial
d. Both liquid and gas side
Q. Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.
a. Dry-bulb
b. Wet-bulb
c. Dew point
d. Adiabatic saturation
Q. In case of unsaturated air
a. Dew point < wet bulb temperature
b. Wet bulb temperature < dry bulb temperature
c. Both (A) and (B)
d. Neither (A) not (B)
Q. The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an
a. Pure component
b. Binary mixture
c. Ternary mixture
d. Insoluble binary system
Q. __________ extractor is used for the concentration of radioactive nuclear waste.
a. Pulsed column
b. Sieve plate
c. Mixer-settler
d. Bollman