Mass Transfer MCQs | Page - 39

Dear candidates you will find MCQ questions of Mass Transfer here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

M

Mr. Dubey • 98.74K Points
Coach

Q. An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is:

  • (A) 9.21
  • (B) 4.605
  • (C) 100
  • (D) 0.001
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M

Mr. Dubey • 98.74K Points
Coach

Q. The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by

  • (A) Increasing the gas film co-efficient
  • (B) Increasing the liquid film co-efficient
  • (C) Increasing the total pressure
  • (D) Decreasing the total pressure
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M

Mr. Dubey • 98.74K Points
Coach

Q. Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

  • (A) Higher dew point
  • (B) Higher absolute (specific) humidity
  • (C) Higher relative humidity
  • (D) Higher wet bulb temperature
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Mr. Dubey • 98.74K Points
Coach

Q. When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

  • (A) 1
  • (B) < 1
  • (C) > 1
  • (D) ∞
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Mr. Dubey • 98.74K Points
Coach

Q. With increase in the concentration of the adsorbate, the integral heat of adsorption

  • (A) Increases
  • (B) Decreases
  • (C) Remains unchanged
  • (D) May increase or decrease; depends on the type of adsorbate
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Mr. Dubey • 98.74K Points
Coach

Q. Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

  • (A) Increases pressure drop, increases surface area
  • (B) Increases pressure drop, decreases surface area
  • (C) Decreases pressure drop, increases surface area
  • (D) Decreases pressure drop, decreases surface area
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M

Mr. Dubey • 98.74K Points
Coach

Q. A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

  • (A) Flow rate of inlet air
  • (B) Relative humidity of outlet air
  • (C) Humidity of inlet air
  • (D) Temperature of the solid
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Mr. Dubey • 98.74K Points
Coach

Q. Fenske equation for determining the minimum number of theoretical stages in distillation column holds good, when the

  • (A) Relative volatility is reasonably constant
  • (B) Mixture (to be separated) shows negative deviation from ideality
  • (C) Mixture (to be separated) shows positive deviation from ideality
  • (D) Multi-component distillation is involved
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Mr. Dubey • 98.74K Points
Coach

Q. When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.

  • (A) Temperature rises
  • (B) Pressure rises
  • (C) Temperature falls
  • (D) Pressure falls
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M

Mr. Dubey • 98.74K Points
Coach

Q. Pick out the wrong statement.

  • (A) Critical moisture content is not a property of the material itself
  • (B) A sharp increase in pressure drop gives an indication of the flooding in a distillation column
  • (C) Separation of components is not possible in liquid extraction, if selectivity is unity
  • (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum
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