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Mass Transfer problems


  • 1. Which is the controlling factor for a drum drier?

  • Options
  • A. Diffusion
  • B. Heat transfer
  • C. Both (a) and (b)
  • D. Neither (a) nor (b)
  • Discuss
  • 2. When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

  • Options
  • A. natural
  • B. forced
  • C. induced
  • D. none of these
  • Discuss
  • 3. Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.

  • Options
  • A. chemical properties
  • B. physical properties
  • C. degree of turbulence
  • D. interfacial area
  • Discuss
  • 4. With increase in pressure, the relative volatility for a binary system

  • Options
  • A. increases.
  • B. decreases.
  • C. remains same.
  • D. either (a) or (b), depends on the system.
  • Discuss
  • 5. In batch distillation with constant reflux, overhead product composition __________ with time.

  • Options
  • A. increases
  • B. decreases
  • C. does not vary
  • D. may increase on decrease, depends on the system.
  • Discuss
  • 6. Overall efficiency of the distillation column is

  • Options
  • A. the ratio of number of ideal plates to actual plates.
  • B. the ratio of number of actual plates to ideal plates.
  • C. same as the Murphree efficiency.
  • D. always more than the point efficiency.
  • Discuss
  • 7. Which of the following unit operations makes use of Thiele-Geddes equation?

  • Options
  • A. Liquid-liquid extraction
  • B. Solid-liquid extraction
  • C. Multicomponent absorption with chemical reaction
  • D. Multicomponent distillation.
  • Discuss
  • 8. The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

  • Options
  • A. natural draft cooling tower
  • B. induced draft cooling tower
  • C. spray chamber
  • D. none of these
  • Discuss
  • 9. As the reflux ratio in a distillation coloumn is increased from the minimum, the

  • Options
  • A. slope of the operating line in stripping section decreases.
  • B. number of plates decreases very slowly first and then more and more rapidly.
  • C. total cost first decreases and then increases.
  • D. liquid flow increases while the vapor flow decreases for a system.
  • Discuss
  • 10. Total reflux in a distillation operation requires minimum

  • Options
  • A. reboiler load
  • B. number of plates
  • C. condenser load
  • D. all (a), (b) and (c)
  • Discuss

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