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Chemical Engineering :: Mass Transfer

  1. Percentage saturation is __________ the relative saturation.

  2. A.
    always smaller than
    B.
    always greater than
    C.
    not related to
    D.
    none of these

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  3. In case of a desorber (stripper), the

  4. A.
    operating line always lies above the equilibrium curve.
    B.
    operating line always lies below the equilibrium curve.
    C.
    temperature remains unaffected.
    D.
    temperature always increases.

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  5. What is the reflux ratio at total reflux ?

  6. A.
    Zero
    B.
    Infinity
    C.
    Unity
    D.
    Data insufficient

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  7. Under conditions of flooding in packed tower, the gas pressure drop

  8. A.
    decreases rapidly
    B.
    increases rapidly
    C.
    remains constant
    D.
    is maximum

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  9. For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

  10. A.
    1-5
    B.
    10-60
    C.
    200-300
    D.
    > 500

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  11. For absorbing a sparingly soluble gas in a liquid

  12. A.
    gas side mass transfer co-efficient should be increased.
    B.
    liquid side mass transfer co-efficient should be increased.
    C.
    liquid side mass transfer co-efficient should be decreased.
    D.
    mass transfer co-efficient must be kept constant.

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  13. Channelling in a packed tower results from the

  14. A.
    high pressure drop
    B.
    maldistribution of liquid
    C.
    non-uniformity of packing
    D.
    both (b) and (c)

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  15. The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its

  16. A.
    integral heat of adsorption.
    B.
    heat of wetting.
    C.
    differential heat of adsorption.
    D.
    heat of normal condensation.

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  17. The minimum number of theoretical plates is required for achieving a given separation in distillation column with

  18. A.
    no reflux
    B.
    total reflux
    C.
    zero reflux ratio
    D.
    minimum reflux ratio

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  19. A good solvent used for absorption should not have very high

  20. A.
    viscosity
    B.
    vapor pressure
    C.
    freezing point
    D.
    all (a), (b) & (c)

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