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Chemical Engineering :: Mass Transfer

  1. When both the fluids flow concurrently in an absorber, the slope of the operating line is

  2. A.
    - ve
    B.
    + ve
    C.
    1
    D.
    -1

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  3. The percentage humidity is less than the relative humidity only at __________ percent humidity.

  4. A.
    zero
    B.
    hundred
    C.
    both zero and hundred
    D.
    none of these

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  5. Back-trapping in a distillation column

  6. A.
    increases tray efficiency.
    B.
    decreases tray efficiency.
    C.
    reduces pressure drop.
    D.
    is desirable, as it provides improved vapour-liquid contact.

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  7. Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.

  8. A.
    less than
    B.
    more than
    C.
    same as
    D.
    very much less

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  9. Milk is dried usually in a __________ dryer.

  10. A.
    freeze
    B.
    spray
    C.
    tray
    D.
    rotary

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  11. At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbant

  12. A.
    increases
    B.
    decreases
    C.
    remains unchanged
    D.
    increases exponentially

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  13. Which of the following adsorbent is used to decolourise yellow glycerine ?

  14. A.
    Silica gel
    B.
    Alumina
    C.
    Fuller's earth
    D.
    Activated carbon

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  15. Which of the following liquid temperature (T) Vs. vapor-gas mixture enthalpy (H) diagram is valid for humidification operation?

  16. A.
    B.
    C.
    D.
    none of these.

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  17. In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

  18. A.
    increases.
    B.
    decreases.
    C.
    remains unaffected.
    D.
    and the heat required in reboiler decreases.

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  19. Pick out the wrong statement.

  20. A.
    Constant pressure distillation can not separate an azeotropic mixture.
    B.
    Relative volatility of a binary mixture changes appreciably with the minor change in temperature.
    C.
    The relative volatility of a binary mixture at azeotropic composition is unity.
    D.
    Flash distillation is practised on wide spread scale in petroleum refinery.

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