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Home Chemical Engineering Mass Transfer Comments

  • Question
  • 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.

  • Correct Answer
  • decreases 


  • Mass Transfer problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. The equivalent diameter for pressure drop is __________ that for heat transfer.

    • Options
    • A. smaller than
    • B. greater than
    • C. equal to
    • D. not related with
    • 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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