Mass Transfer MCQs with answers Page - 14

Here, you will find a collection of MCQ questions on Mass Transfer. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. Which of the following is directly concerned with Psychrometry?

  • (A) Lewis relationship
  • (B) Galileo number
  • (C) Weber number
  • (D) Dean number

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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

A

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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

A

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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

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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

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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

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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

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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

A

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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

A

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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)

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