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Chemical Engineering :: Mass Transfer

  1. On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

  2. A.
    greater degree of separation with a fixed number of trays
    B.
    increased reboiler load
    C.
    increased reflux ratio
    D.
    None of these.

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  3. __________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.

  4. A.
    Watted wall
    B.
    Packed
    C.
    Plate
    D.
    Spray

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  5. Deairation (removal of O2) of water is done by

  6. A.
    rectification
    B.
    absorption
    C.
    ion-exchange
    D.
    adsorption

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  7. Make up water is supplied during cooling tower operation to compensate for water losses due to

  8. A.
    evaporation
    B.
    blowdown
    C.
    entrainment
    D.
    all (a), (b)&(c)

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  9. Pick out the wrong statement.

  10. A.
    The mole fraction of solute is directly proportional to the molality of a 'dilute' solution.
    B.
    For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is nonlinear in the case of steady state unimolal unidirectional diffusion.
    C.
    Azeotropes obey Raoult's law at all temperature.
    D.
    The relative volatility of a binary mixture at the azeotropic composition is 1.

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  11. A minimum boiling azeotrope is exemplified by

  12. A.
    toluene-benzene
    B.
    acetone-carbon disulphide
    C.
    water-isobutyl alcohol
    D.
    none of these

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  13. Which of the following solutions will follow Raoult's law most closely ?

  14. A.
    A solution of benzene, toluene and oxylene.
    B.
    35% solution of camphor in water.
    C.
    35% solution of NH3 in water.
    D.
    A solution of polar organic compounds (not of homologs of a series).

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  15. Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

  16. A.
    increases pressure drop, increases surface area.
    B.
    increases pressure drop, decreases surface area.
    C.
    decreases pressure drop, increases surface area.
    D.
    decreases pressure drop, decreases surface area.

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  17. Critical humidity of a solid salt means the humidity

  18. A.
    above which it will always become damp.
    B.
    below which it will always stay dry.
    C.
    both (a) and (b).
    D.
    above Which it will always become dry and below which it will always stay damp.

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  19. The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are

  20. A.
    parallel
    B.
    straight
    C.
    both parallel and straight
    D.
    neither parallel nor straight

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