chemical engineering mass transfer MCQs – Page 2

Practise multiple-choice questions from chemical engineering mass transfer for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mass transfer Mcqs

21. The commonly used solvent in supercritical extraction is_____________________?
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A. Carbon tetrachloride

B. Methyl ethyl ketone

C. Carbon dioxide

D. Water

22. Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ?
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A. T vs. P

B. log P vs. log T

C. log P vs. T

D. P vs. log T

23. Large scale drying of sugar is done in a _______________ dryer?
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A. Truck

B. Tray

C. Rotary

D. Spouted bed

24. ___________________ extractor uses centrifugal force for separating the two phases?
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A. Podbielniak

B. Treybal

C. Scheibel

D. None of these

25. To get high tray efficiency___________________?
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A. Time of contact between the two phases should be less

B. Liquid entrainment should be severe

C. Interfacial surface between liquid and gas phase should be large

D. Gas velocity should be very low

26. At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ?
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A. 99

B. 91.5

C. 90

D. 95

27. In rectifying section of a continuous distillation column, the____________________?
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A. Vapour is enriched with high boilers

B. Vapour is enriched with low boilers

C. None of these

D. Liquid is stripped of high boilers

28. Molality is defined as the number of gm moles of solute per _________________ of solvent ?
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A. Litre

B. gm

C. Kg

D. m3

29. Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in_________________?
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A. Large number of trays

B. Large minimum liquid to gas (L/G) ratio

C. Decreased solute solubility

D. All A., B. and C.

30. Paper industry employs _______________ driers?
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A. Spray

B. Cylinder

C. Rotary

D. Fluidised bed

31. Removal of ______________ exemplifies an adsorption unit operation?
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A. Ammonia from coke oven gas

B. Water from petrol

C. Mustard oil from mustard seed

D. Uranium from its ore

32. For stripping of a gas in a counter current stripper, the operating line _____________________?
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A. Lies below the equilibrium curve

B. Is always parallel to the equilibrium curve

C. Lies above the equilibrium curve

D. Can lie above or below the equilibrium curve

33. With increase in temperature, the leaching rate increases because of the _____________________?
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A. Increased diffusivity

B. Decreased viscosity of liquid

C. Both A. and B.

D. Neither A. nor B.

34. Plate efficiency in a distillation column is reduced due to the ______________ of liquid?
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A. All A., B. & C.

B. Foaming

C. Entrainment

D. Weeping & dumping

35. Separation of two volatile liquids by distillation makes use of their________________________?
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A. Relative volatility

B. Selectivity

C. Density difference

D. Solubility

36. Mechanism of moisture removal in case of freeze drying of food stuff is by ___________________?
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A. Adsorption

B. Dehydration

C. Sublimation

D. Evaporation

37. Which of the following provides maximum contact surface for a liquid-vapour system ?
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A. Wetted wall column

B. Packed tower

C. Sieve-plate column

D. Bubble-cap plate column

38. The minimum liquid rate to be used in an absorber corresponds to an operating line__________________?
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A. Of slope = 1

B. Tangential to the equilibrium curve

C. Of slope = 0.1

D. None of these

39. Minimum reflux ratio in a distillation column results in_____________________?
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A. Optimum number of trays

B. Minimum number of trays

C. Minimum reboiler size

D. Maximum condenser size

40. Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a ________________ column?
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A. Packed

B. Wetted wall

C. Bubble cap plate

D. Spray

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