Mass Transfer MCQs with answers Page - 69

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Q. Cox chart is useful in the design of

  • (A) Distillation column
  • (B) Evaporator
  • (C) Dryer
  • (D) Crystalliser

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Q. Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are:

  • (A) 4
  • (B) 8
  • (C) 9
  • (D) 10

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Q. In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer.

  • (A) The entire amount of C is transferred to solvent B
  • (B) Less than 2 kg but more than 1 kg of C is transferred to solvent B
  • (C) Less than 1 kg of C is transferred to B
  • (D) No amount of C is tr

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Q. With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature).

  • (A) Increases
  • (B) Remains unchanged
  • (C) Decreases
  • (D) Decreases linearly

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Q. As the reflux ratio decreases, the

  • (A) Separation becomes more efficient
  • (B) Number of plates increases
  • (C) Column diameter increases
  • (D) None of these

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Q. Only small amount of evaporation of water produces large cooling effects because of its

  • (A) Large latent heat
  • (B) Low viscosity
  • (C) Small latent heat
  • (D) None of these

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Q. Ion exchange process is similar to

  • (A) Absorption
  • (B) Adsorption
  • (C) Extraction
  • (D) Leaching

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Q. Physical absorption is

  • (A) An irreversible phenomenon
  • (B) A reversible phenomenon
  • (C) Accompanied by evolution of heat
  • (D) Both (B) and (C)

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Q. Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

  • (A) Schmidt
  • (B) Sherwood
  • (C) Peclet
  • (D) Stanton

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Q. If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is

  • (A) L/G
  • (B) G/L
  • (C) Always < 1
  • (D) None of these

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