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Chemical Engineering :: Mass Transfer

  1. Molecular distillation is

  2. A.
    high temperature distillation
    B.
    for heat-sensitive materials
    C.
    very low pressure distillation
    D.
    both (b) and (c)

  3. Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant

  4. A.
    humidity
    B.
    velocity
    C.
    temperature
    D.
    all (a), (b) & (c)

  5. Which of the following provides maximum contact surface for a liquid-vapour system?

  6. A.
    Packed tower
    B.
    Bubble-cap plate column
    C.
    Seive-plate column
    D.
    Wetted wall column

  7. For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

  8. A.
    calculated
    B.
    unknown
    C.
    known
    D.
    not required

  9. In stripping section of continuous distillation column, the

  10. A.
    liquid is stripped of high boiler.
    B.
    liquid is enriched with high boiler.
    C.
    vapour is stripped of low boiler.
    D.
    none of these.

  11. Molality is defined as the number of gm moles of solute per __________ of solvent.

  12. A.
    litre
    B.
    gm
    C.
    Kg
    D.
    m3

  13. __________ is concerned with the adsorption equilibria.

  14. A.
    Fick's law
    B.
    Gibb's equation
    C.
    Freundlich equation
    D.
    none of these

  15. Which of the following is the correct ternery diagram for liquid-liquid extraction system comprising of one pair partly soluble (e.g. water-benzene-acetic acid in which A-diluent, B - solvent and C - solute)?


  16. Fractional solvent extraction

  17. A.
    employs only one solvent
    B.
    employs two solvents
    C.
    results in low interfacial tension
    D.
    none of these

  18. In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

  19. A.
    at ground level.
    B.
    2 metres above the ground.
    C.
    5 metres above ground.
    D.
    10 metres above ground.