Mass Transfer MCQs with answers Page - 28

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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Admin • 833.24K Points
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Q. Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.

  • (A) Free
  • (B) Unbound
  • (C) Equilibrium
  • (D) Bound

A

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Q. For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

  • (A) Increases
  • (B) Decreases
  • (C) Remain same
  • (D) Either (A) or (B); depends on the gas

A

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Q. A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

  • (A) 10-15
  • (B) 30-40
  • (C) 70-80
  • (D) 90-100

A

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Q. 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

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

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Q. Which of the following is not fixed by the process requirements, in the design of absorbers?

  • (A) Flow rate of the entering gas
  • (B) Composition of the entering liquid
  • (C) Terminal concentrations of gas stream
  • (D) None of these

A

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Q. Pick out the wrong statement:

  • (A) Absorption factor is constant, when the equilibrium and operating lines are straight
  • (B) In case of a stripper, the equilibrium curve is always below the operating line
  • (C) In case of an absorber, the operating line is always above the equilibrium curve
  • (D) In the absorption of low solubility gases, the liquid film is the controlling resistance

A

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Q. Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

  • (A) Humidification only
  • (B) Heating only
  • (C) Both heating and humidification
  • (D) Evaporative cooling

A

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Q. The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

  • (A) NSc = 1
  • (B) NSc = NPr = NLe
  • (C) NPr = NLe
  • (D) NSc = NLe

A

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Q. Pick out the wrong statement. Generally for physical adsorption, a gas of

  • (A) Higher molecular weight is adsorbed in preference to a gas of low molecular weight
  • (B) High critical temperature is adsorbed in preference to a gas of low critical temperature
  • (C) Low volatility is adsorbed in preference to a gas of high volatility
  • (D) None of these

A

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Q. Co-current absorbers are usually used when the gas to be dissolved in the liquid is

  • (A) Sparingly soluble
  • (B) Highly soluble
  • (C) A pure substance
  • (D) A mixture

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