Home / Chemical Engineering / Mass Transfer :: Section 6

Chemical Engineering :: Mass Transfer

  1. Humid volume is the total volume in m3 of 1 kg of

  2. A.
    vapour laden gas at 1 atm. and room temperature.
    B.
    gas plus its accompanying vapour at 1 atm. and room temperature.
    C.
    gas plus its accompanying vapour at 1 atm. and gas temperature.
    D.
    vapour laden gas at 1 atm. and gas temperature.

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. Diameter to height ratio for a rashig ring is

  4. A.
    1
    B.
    0.5
    C.
    2
    D.
    8

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. The equipment used in the extraction of highly corrosive radio active liquids is

  6. A.
    pulse column
    B.
    spray column
    C.
    mixer settler
    D.
    baffle tower

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. Advantage of continuous drying over batch drying is that the

  8. A.
    drying cost per unit weight of dried product is less.
    B.
    product with more uniform moisture content is produced.
    C.
    equipment size required is smaller.
    D.
    all 'a', 'b' & 'c'

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)

  10. A.
    increases
    B.
    decreases
    C.
    remains unaffected
    D.
    increases Linearly

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. In a packed bed absorption column, the channelling will be noted by the

  12. A.
    increase in flow rate.
    B.
    sharp drop in pressure drop.
    C.
    sharp rise in pressure drop.
    D.
    none of these.

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. Gaseous diffusivity at atmospheric pressure is of the order of __________ cm2/second.

  14. A.
    1
    B.
    1 to 5
    C.
    5 to 10
    D.
    > 10

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. In liquid-liquid extraction, the number of phases at plait point is

  16. A.
    1
    B.
    2
    C.
    3
    D.
    4

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer.

  18. A.
    The entire amount of C is transferred to solvent B.
    B.
    Less than 2 kg but more than 1 kg of C is transferred to solvent B.
    C.
    Less than 1 kg of C is transferred to B.
    D.
    No amount of C is tranferred to B.

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. The surface renewal frequency in Danckwerts' model of mass transfer is given by (KL: mass transfer co-efficient)

  20. A.
    KL2.DA
    B.
    KL2.DA
    C.
    KL2/DA
    D.
    KL/DA2

    View Answer

    Workspace

    Discuss Discuss in Forum