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Chemical Engineering :: Mass Transfer

  1. Dryer widely used in a textile industry is __________ dryer.

  2. A.
    festoon
    B.
    cylinder
    C.
    conveyor
    D.
    tunnel

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  3. Solvent used in extractive distillation

  4. A.
    changes the relative volatility of the original components.
    B.
    should be of high volatility.
    C.
    should form azeotropes with the original components.
    D.
    all (a), (b) and (c)

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  5. Air at a particular humidity is heated in a furnace. The new dew point

  6. A.
    decreases
    B.
    increases
    C.
    depends on the extent of heating
    D.
    remain unchanged

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  7. In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)

  8. A.
    straight
    B.
    parallel
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  9. The vapour pressure exerted by the moisture contained in a wet solid depends upon the

  10. A.
    nature of the moisture.
    B.
    temperature.
    C.
    nature of the solid.
    D.
    all (a), (b) and (c).

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  11. The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line)

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  13. Smoke is an example of

  14. A.
    solid dispersed in liquid
    B.
    solid dispersed in gas
    C.
    liquid dispersed in gas
    D.
    gas dispersed in liquid

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  15. Which of the following adsorbant is used in the refinning of sugar ?

  16. A.
    Bone charcoal
    B.
    Wood charcoal
    C.
    Silica gel
    D.
    Activated clay

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  17. Stacked packing compared to dumped packing

  18. A.
    provides poorer contact between the fluids.
    B.
    gives lower pressure drop.
    C.
    both (a) and (b).
    D.
    gives higher pressure drop.

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  19. In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

  20. A.
    total
    B.
    minimum
    C.
    operating
    D.
    maximum permissible

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