Mass Transfer MCQs with answers Page - 68

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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A

Admin • 802.91K Points
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Q. Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be

  • (A) 1
  • (B) > 1
  • (C) < 1
  • (D) ≤ 1

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Q. Pick out the wrong statement.

  • (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given ‘L/V’ ratio
  • (B) The extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction
  • (C) Natural draft cooling towers are made of ferroconcrete and its cross-section is wider at the bottom
  • (D) Vander wall adsorption is also called chemisorption

A

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Q. Molarity is defined as the number of gm moles of solute per __________ of solvent.

  • (A) Litre
  • (B) kg
  • (C) gm
  • (D) c.c

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Q. If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

  • (A) 1.2 to 1.5
  • (B) 2.5 to 3
  • (C) 3 to 4
  • (D) 5

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Q. Adsorption is a unit operation which generally involves __________ systems.

  • (A) Liquid-solid
  • (B) Gas-solid
  • (C) Fluid-solid
  • (D) Solid-solid

A

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Q. Surface renewal model of mass transfer was enunciated by

  • (A) Toor and Marcello
  • (B) Fick
  • (C) Danckwerts
  • (D) Stefan

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Q. Agitator is provided in a crystalliser for

  • (A) Avoiding deposition on cooler surfaces
  • (B) Formation of nuclei
  • (C) Crystal growth
  • (D) All (A), (B) and (C)

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Q. Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

  • (A) Mass diffusivity to momentum diffusivity
  • (B) Thermal diffusivity to mass diffusivity
  • (C) Momentum diffusivity to thermal diffusivity
  • (D) None of these

A

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

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

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Q. Sand is dried in foundries in a _________drier.

  • (A) Rotary
  • (B) Fluidised bed
  • (C) Vacuum
  • (D) Spray

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