Following are some of the multiple choice questions on the Mass Transfer with answers that will help the students in developing their knowledge.
Mass Transfer MCQ
1. Leaching of coarse solid lumps is also termed as
2. Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is
3. With increase in temperature, the leaching rate increases because of the
4. The most economical range of absorption factor is
5. Which of the following is an undesirable property in a tower packing?
6. Advantage of continuous drying over batch drying is that the
7. __________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid.
8. Channelling in a packed tower results from the
9. Pick out the wrong statement. Generally for physical adsorption, a gas of
10. Dew point of a gas-vapour mixture
11. A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)
12. Overall efficiency of the distillation column is
13. Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.
14. __________ extractor is used for the concentration of radioactive nuclear waste.
15. Dew point of an air-water vapor mixture
16. In case of a desorber (stripper), the
17. The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.
18. Which of the following equipments is not used for gas dispersion?
19. The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same.
20. In case of an absorber, the operating
21. In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of
22. The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is
23. In a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency
24. __________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.
25. The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are
26. If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)
27. Which of the following employs an accessory known as 'drift eliminator' ?
28. Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.
29. 'Absorption with chemical reaction' is involved in the removal of
30. Laboratory determination of the dif-fusivity of vapor is done by __________ method.
31. Drying of a solid involves __________ transfer.
32. Dryer widely used in a textile industry is __________ dryer.
33. With increase in temperature, the solubility of gases in liquids, at fixed pressure
34. Which of the following equipments is not used in liquid-liquid extraction?
35. Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
36. The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity Dsub>BA (for component B diffusing in A) for a binary mixture of
37. For absorbers, high pressure drop results in
38. The solvent used in liquid extraction should not have high latent heat of vaporisation, because
39. Ponchan-Savarit method analyses the fractional equipment based on
40. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?
41. Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular difusion, if
42. Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.
43. One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect
44. The recovery of pencillin from the acidified fermentation broth is done by
45. Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be
46. Which is not concerned directly with mass transfer?
47. The 'shanks system' of leaching (i.e., counter-current multiple contact leaching) is used for
48. Which of the following is directly concerned with psychrometry?
49. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop
50. Flooding in a distillation column is detected by a sharp
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