Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. Which of the following solutions will follow Raoult's law most closely?
a. A solution of benzene, toluene and o-xylene
b. 35% solution of camphor in water
c. 35% solution of NH3 in water
d. A solution of polar organic compounds (not of homologue of a series)
Q. For continuous drying of granular or crystalline material, the dryer used is the __________dryer.
a. Tunnel
b. Tray
c. Rotary
d. None of these
Q. Pick out the correct statement.
a. In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity
b. With increase in temperature, the selectivity of the solvent used in solvent extraction decreases
c. The selectivity of solvent used in solvent extraction is unity at the plait point
d. All (A), (B) and (C)
Q. __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
a. Packed
b. Bubble
c. Spray
d. Tray
Q. As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches
a. That of normal condensation
b. Integral heat of adsorption
c. Zero
d. None of these
Q. During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the
a. Gas film
b. Liquid film
c. Liquid-gas interface
d. None of these
Q. Relative humidity is the ratio of the
a. Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
b. Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
c. Actual humidity to saturation humidity
d. None of these
Q. In the absorption of ammonia in water, the main resistance to absorption is by the__________ phase.
a. Liquid
b. Gas
c. Both (A) & (B)
d. Neither (A) nor (B)
Q. In paper industry, paper is dried in a __________ dryer.
a. Tunnel
b. Heated cylinder
c. Conveyor
d. Festoon
Q. Which of the following plays an important role in problems of simultaneous heat and mass transfer?
a. Lewis number
b. Schmidt number
c. Prandtl number
d. Sherwood number
Q. If f = moles of vapour present per mole of feed, then the slope of feed line is (McCabeThiele method)
a. (1 - f)/f
b. - (f - 1)/f
c. -1/f
d. -f/(1 - f)
Q. Pick out the wrong statement.
a. The operating line always lies above the equilibrium solubility curve in case of a single component absorber
b. The operating line always lies below the equilibrium solubility curve in case of a single component stripper
c. The operating pressure in solvent extraction system should be below vapor pressures of all components
d. The solubility of a particular gas in ideal solution in any solvent is always the same
Q. Mass transfer co-efficient of liquid is
a. Affected more by temperature than that for gases
b. Affected much less by temperature than that for gases
c. Not affected by the temperature
d. None of these