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Chemical Engineering :: Mass Transfer

Mass Transfer - Section 1
Mass Transfer - Section 2
Mass Transfer - Section 3
Mass Transfer - Section 4
Mass Transfer - Section 5
Mass Transfer - Section 6
Mass Transfer - Section 7
Mass Transfer - Section 8
Mass Transfer - Section 9
Mass Transfer - Section 10
Mass Transfer - Section 11
Mass Transfer - Section 12
Mass Transfer - Section 13
Mass Transfer - Section 14

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

    3. 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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  3. What is the reflux ratio at total reflux ?

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

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

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

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  5. 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).

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

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  6. For absorbing a sparingly soluble gas in a liquid

    7. 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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  7. Channelling in a packed tower results from the

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

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  8. 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

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

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

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

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

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

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