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Chemical Engineering :: Mass Transfer

  1. In a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency

  2. A.
    liquid stream should be distributed uniformly.
    B.
    gas stream should be distributed uniformly.
    C.
    both gas as well as liquid streams should be distributed uniformly.
    D.
    by passing should be completely avoided.

  3. Reverse osmosis is also called

  4. A.
    dialysis
    B.
    electrodilysis
    C.
    diffusion
    D.
    ultrafiltration.

  5. Which of the following is not a batch drier?

  6. A.
    Truck drier
    B.
    Agitated pan drier
    C.
    Fluidised bed drier
    D.
    Vacuum shelf drier

  7. Steam distillation is not recommended to be used, if the

  8. A.
    azeotropic mixture is to be separated and the final product is miscible with water.
    B.
    liquids decompose, if distilled directly at atmospheric pressure.
    C.
    material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature.
    D.
    material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature.

  9. Rayleigh equation applies to __________ distillation.

  10. A.
    differential
    B.
    flash
    C.
    equilibrium
    D.
    molecular

  11. Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as

  12. A.
    D0.5
    B.
    D
    C.
    1/D
    D.
    D1.5

  13. Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

  14. A.
    size
    B.
    durability
    C.
    porosity
    D.
    cost

  15. __________ is the separation technique used for desalination of sea water.

  16. A.
    Thermal diffusion
    B.
    Reverse osmosis
    C.
    Adsorption
    D.
    absorption

  17. The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture.

  18. A.
    reducing the total pressure
    B.
    increasing the total pressure
    C.
    reducing the temperature
    D.
    both (b) and (c)

  19. Danckwerts developed the __________ theory.

  20. A.
    penetration
    B.
    surface renewal
    C.
    film
    D.
    none of these