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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. In a counter-current liquid extractor

    2. A.
    both liquids flow at fixed rate.
    B.
    both liquids can have any desired flow rate.
    C.
    only one of the liquids may be pumped at any desired rate.
    D.
    liquid's flow rate depends upon the temperature and pressure.

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  2. Which of the following is an undesirable property for an absorbing solvent ?

    3. A.
    Low vapour pressure
    B.
    Low velocity
    C.
    Low freezing point
    D.
    None of these

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  3. The wetted wall tower is used to determine

    4. A.
    individual mass transfer co-efficient (M.T.C.) in gaseous system.
    B.
    M.T.C. of individual components in a liquid-liquid system.
    C.
    M.T.C. of liquid in liquid-gas system.
    D.
    the overall M.T.C. of the system.

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  4. Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is

    5. A.
    less
    B.
    more
    C.
    same
    D.
    unpredictable

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  5. Positive deviation from Raoult's law means a mixture whose total pressure is

    6. A.
    greater than that computed for ideality.
    B.
    less than that computed for ideality.
    C.
    less than the sum of the vapour pressure of the components.
    D.
    none of these.

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  6. With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

    7. A.
    increases
    B.
    decreases
    C.
    decreases linearly
    D.
    remains unaffected

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  7. Schmidt number is given by

    8. A.
    B.
    Re.Pe
    C.
    Sh x Pe
    D.
    Re/Pe

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  8. The caking of crystals can be prevented by

    9. A.
    maintaining high critical humidity.
    B.
    maintaining low critical humidity.
    C.
    coating the product with inert material.
    D.
    both (a) and (c)

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  9. Prandtl number for water at 20°C is about

    10. A.
    7
    B.
    70
    C.
    0.7
    D.
    150.

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