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Home Chemical Engineering Mass Transfer Comments

  • Question
  • The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by


  • Options
  • A. raising the temperature.
  • B. lowering the total pressure.
  • C. both (a) and (b).
  • D. neither (a) nor (b).

  • Correct Answer
  • both (a) and (b). 


  • Mass Transfer problems


    Search Results


    • 1. In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is

    • Options
    • A. 0.50
    • B. 0.60
    • C. 2
    • D. 1
    • Discuss
    • 2. Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty?

    • Options
    • A. Sieve plate column
    • B. Bubble cap column
    • C. Randomly packed column
    • D. Wetted wall column
    • Discuss
    • 3. Separation of two or more components of a liquid solution can not be achieved by

    • Options
    • A. fractional crystallisation
    • B. liquid extraction
    • C. absorption
    • D. evaporation
    • Discuss
    • 4. Relative humidity is the ratio of the

    • Options
    • A. partial pressure of the vapour to the vapour pressure of the liquid at room temperature.
    • B. partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
    • C. actual humidity to saturation humidity.
    • D. none of these
    • Discuss
    • 5. At minimum reflux ratio for a given separation

    • Options
    • A. number of plates is zero.
    • B. number of plates is infinity.
    • C. minimum number of the theoretical plates is required.
    • D. separation is most efficient.
    • Discuss
    • 6. Chemisorption (chemical adsorption) is

    • Options
    • A. same as "Van der Waals" adsorption.
    • B. characterised by adsorption of heat.
    • C. an irreversible phenomenon.
    • D. a reversible phenomenon.
    • Discuss
    • 7. On addition of solute in the solvent, the __________ of the solution decreases.

    • Options
    • A. boiling point
    • B. freezing point
    • C. vapour pressure
    • D. both (b) and (c)
    • Discuss
    • 8. In case of an absorber, the operating

    • Options
    • A. line always lies above the equilibrium curve.
    • B. line always lies below the equilibrium curve.
    • C. line can be either above or below the equilibrium curve.
    • D. velocity is more than the loading velocity.
    • Discuss
    • 9. In distillation, overhead product contains

    • Options
    • A. only one component
    • B. two components
    • C. any number of components
    • D. only saturated liquid
    • Discuss
    • 10. Drying operation under vacuum is carried out to

    • Options
    • A. dry those materials which have very high unbound mositure content.
    • B. reduce drying temperature.
    • C. increase drying temperature.
    • D. dry materials having high bound moisture content.
    • Discuss


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