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Chemical Engineering :: Mass Transfer

  1. A packed tower compared to a plate tower for a particular mass transfer operation

  2. A.
    incurs smaller pressure drop.
    B.
    allows installation of cooling coils.
    C.
    is less costly when built in large sizes/diameters.
    D.
    is more suitable, if suspended solids are present in fluid streams.

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  3. Which of the following is the most commonly used leaching solvent in vegetable oil industry ?

  4. A.
    Phenol
    B.
    Hexane
    C.
    Furfurol
    D.
    Liquid SO2

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  5. In an absorber, HETP does not vary with the

  6. A.
    flow rate of liquid
    B.
    flow rate of gas
    C.
    type and size of packing
    D.
    none of these

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  7. Large quantity of silica gel is normally dried in a __________ dryer.

  8. A.
    freeze
    B.
    through circulation
    C.
    rotary vacuum
    D.
    tray

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  9. For the same system, if the same liquid used in an absorber is decreased, the tower height will

  10. A.
    increase
    B.
    decrease
    C.
    remain unaffected
    D.
    decrease or increase ; depends on the type of liquid

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  11. Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.

  12. A.
    agitated vessel
    B.
    sieve tray column
    C.
    bubble cap column
    D.
    packed tower

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  13. Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent

  14. A.
    a pure component.
    B.
    a binary mixture.
    C.
    a ternary mixture.
    D.
    partially miscible ternary system.

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  15. In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

  16. A.
    saturated feed is not used.
    B.
    an azeotrope forms.
    C.
    the latent heat of vaporisation of the more and less volatile components are greatly different.
    D.
    a total condenser is used.

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  17. In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be

  18. A.
    liquid phase resistance-controlled.
    B.
    gas phase resistance controlled.
    C.
    impossible.
    D.
    driven by a non-linear driving force.

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  19. As the reflux ratio decreases, the

  20. A.
    separation becomes more efficient.
    B.
    number of plates increases.
    C.
    column diameter increases.
    D.
    none of these.

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