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Chemical Engineering :: Mass Transfer

  1. In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of

  2. A.
    area between operating line and 45° diagonal x-y diagram.
    B.
    condenser and reboiler surfaces.
    C.
    tower cross-section.
    D.
    none of these.

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  3. Wetted wall tower experiment determines the

  4. A.
    molal diffusivity.
    B.
    volumetric co-efficient.
    C.
    mass transfer co-efficient.
    D.
    none of these.

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  5. In McCabe-Thiele method, at infinite reflux ratio

  6. A.
    the overhead product is minimum.
    B.
    both the operating lines coincide with diagonal.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

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  7. With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

  8. A.
    increases
    B.
    decreases
    C.
    remains same
    D.
    may increase or decrease ; depends on individual design

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  9. Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

  10. A.
    packing may be crushed due to thermal expansion/contraction of the components of the equipments.
    B.
    pressure drop in the equipment will be . very high.
    C.
    viscosity variation of the fluids may cause channeling/flooding.
    D.
    none of these.

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  11. The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is

  12. A.
    more
    B.
    less
    C.
    same
    D.
    either more or less; depends on the system

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  13. Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

  14. A.
    wetted wall
    B.
    bubble cap
    C.
    perforated tray
    D.
    packed

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  15. Pick out the system with minimum boiling azeotrope at 1 atm.

  16. A.
    benzene-toluene
    B.
    ethyl alcohol-water
    C.
    hydrochloric acid-water
    D.
    all (a), (b) and (c)

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  17. Free flowing granular materials can be best dried in a __________ drier.

  18. A.
    rotary
    B.
    cylinder
    C.
    drun
    D.
    freeze

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  19. In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,

  20. A.
    inversely
    B.
    linearly
    C.
    exponentially
    D.
    none of these

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