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Chemical Engineering :: Mass Transfer

  1. The value of L/mG ratio for economical absorption operation ranges from

  2. A.
    0.5 to 0.8
    B.
    0.8 to 1.2
    C.
    1.25 to 2.0
    D.
    2.5 to 3.5

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  3. Large scale usage of flash distillation is practised in

  4. A.
    soap manufacturing
    B.
    ammonia synthesis plant
    C.
    polymerisation industry
    D.
    petroleum refinning

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  5. High pressure at the bottom of a distillation tower handling heat sensitive materials results in

  6. A.
    thermal decomposition of bottoms.
    B.
    increased relative volatility.
    C.
    erosion of the tower.
    D.
    very efficient operation.

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  7. Alcohol is dehydrated using __________ distillation.

  8. A.
    extractive
    B.
    azeotropic
    C.
    steam
    D.
    molecular

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  9. Separation of two volatile liquids by distillation makes use of their

  10. A.
    selectivity
    B.
    relative volatility
    C.
    solubility
    D.
    density difference

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  11. Which of the following increases during evaporative cooling process with recirculated water supply ?

  12. A.
    Wet bulb temperature
    B.
    Relative humidity
    C.
    Partial pressure of vapour
    D.
    Both (b) and (c)

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  13. Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.

  14. A.
    rotary
    B.
    tray
    C.
    freeze
    D.
    none of these

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