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Chemical Engineering :: Mass Transfer

  1. Which of the following binary systems is an example of a maximum boiling azeotrope ?

  2. A.
    Water-hydrochloric acid.
    B.
    Acetone-carbon disulphide.
    C.
    Water-ethyl alcohol.
    D.
    n-heptane-n-octane.

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  3. (NRe . NSc) is termed in mass transfer operation as the __________ number.

  4. A.
    Stanton
    B.
    Sherwood
    C.
    Peclet
    D.
    none of these

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  5. The binary diffusivity in gases and liquids vary respectively as

  6. A.
    T3/2 and T
    B.
    T and T3/2
    C.
    T and T3/2
    D.
    T3/2 and T

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  7. Pick out the correct statement.

  8. A.
    The slope of the stripping line is always less than unity.
    B.
    For a given separation in a binary distillation column, with increase in reflux ratio (above the minimum reflux ratio), the fixed cost of the distillation column first increases and then decreases.
    C.
    In Ponchon-Savarit method of no. of theoretical plate determination, the stripping and rectifying operating lines are vertical at total reflux.
    D.
    Kremsor-Brown-Souder's equation is used to calculate the efficiency of a plate tower.

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  9. Pick out the correct statement.

  10. A.
    Dialysis process is used for the production of fresh water from brine.
    B.
    Electrodylsis is used in the manufacture of NaOH.
    C.
    Electrodylsis is used for the refin-ning/purification of petrol.
    D.
    both (b) and (c).

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  11. Pick out the correct statement.

  12. A.
    Bound moisture is removed during constant rate drying period.
    B.
    Free moisture is removed during falling rate drying period.
    C.
    The sum of free moisture and equilibrium moisture in a solid is called the critical moisture.
    D.
    The driving force for mass transfer in a wet solid is its free moisture content.

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  13. Very tall packed towers are divided into series of beds to

  14. A.
    reduce the overall pressure drop
    B.
    avoid channelling
    C.
    reduce liquid hold-up
    D.
    avoid flooding

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  15. Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

  16. A.
    unbound
    B.
    free
    C.
    critical
    D.
    bound

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  17. With increase in temperature, the solubility of gases in liquids, at fixed pressure

  18. A.
    increases
    B.
    decreases
    C.
    remains same
    D.
    either (a) or (b), depends on the system

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  19. In most of the vacuum crystalliser, vacuum is generally produced by means of a

  20. A.
    suction pump
    B.
    compressed air jet
    C.
    steam jet ejector with a barometric condenser
    D.
    none of these

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