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Chemical Engineering :: Mass Transfer

  1. For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

  2. A.
    unsaturated surface
    B.
    constant rate
    C.
    both (a) and (b)
    D.
    neither (a) nor (b).

  3. What is the degree of freedom of an absorption process in which only one component is transferred between phases ?

  4. A.
    3
    B.
    2
    C.
    4
    D.
    1

  5. Sticky material can be dried in a __________ dryer.

  6. A.
    tray
    B.
    rotary
    C.
    fluidised bed
    D.
    none of these

  7. Langmuir equation is associated with

  8. A.
    leaching
    B.
    adsorption
    C.
    steam distillation
    D.
    multicomponent absorption.

  9. During the constant rate period of drying of a solid,

  10. A.
    increased air humidity decreases the rate of drying.
    B.
    increasing the air temperature decreases the drying rate.
    C.
    surface evaporation of unbound moisture occurs.
    D.
    none of these.

  11. At a fixed total pressure, humidity depends only on the

  12. A.
    partial pressure of vapour in the mixture.
    B.
    heat capacity of the vapour.
    C.
    density of the vapour.
    D.
    none of these.

  13. If moisture content of solid on dry basis is X, then the same on wet basis is


  14. Flash distillation is

  15. A.
    same as differential distillation.
    B.
    used for multicomponent systems like crude refining.
    C.
    same as simple distillation.
    D.
    most useful for handling binary systems.

  16. __________ developed the film theory.

  17. A.
    Higbie
    B.
    Fick
    C.
    Ergun
    D.
    Levenspeil

  18. For absorbers, high pressure drop results in

  19. A.
    increased efficiency.
    B.
    decreased efficiency.
    C.
    high operating cost.
    D.
    better gas liquid contact.