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Chemical Engineering :: Mass Transfer

  1. Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be

  2. A.
    cooled
    B.
    humidified
    C.
    both (a) & (b)
    D.
    dehumidified

  3. For absorbing a sparingly soluble gas in a liquid, the

  4. A.
    gas side co-efficient should be increased.
    B.
    liquid side coefficient should be increased.
    C.
    gas side co-efficient should be decreased.
    D.
    liquid side co-efficient should be decreased.

  5. A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

  6. A.
    10-15
    B.
    30-40
    C.
    70-80
    D.
    90-100

  7. The boiling points of pure components of a binary system __________ with increase in total pressure of the system.

  8. A.
    decreases
    B.
    increases
    C.
    remains unchanged
    D.
    may increase or decrease, depends on the system.

  9. The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the

  10. A.
    differential heat of adsorption.
    B.
    heat of wetting.
    C.
    integral heat of adsorption.
    D.
    none of these.

  11. Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

  12. A.
    KD
    B.
    KD
    C.
    KD1.5
    D.
    KD2

  13. Desulphurisation of petrol is done in a

  14. A.
    Bollman extractor
    B.
    rotating disc extractor
    C.
    packed extraction column
    D.
    plate type extraction column

  15. Chemisorption compared to physical absorption has

  16. A.
    lower adsorption rate.
    B.
    lower capacity of the solvent for the solute gas.
    C.
    increased utilisation of stagnant zones of the liquid phase.
    D.
    none of these.

  17. Rate of adsorption increases as the

  18. A.
    temperature increases.
    B.
    temperature decreases.
    C.
    pressure decreases.
    D.
    size of adsorbent increases.

  19. Pick out the system with maximum boiling azeotrope at 1 atm.

  20. A.
    acetone chloroform
    B.
    ethyl alcohol-water
    C.
    benzene-ethyl alcohol
    D.
    none of these