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Chemical Engineering :: Process Equipment and Plant Design

  1. Maximum allowable vapour velocity in a bubble cap tower is determined by the

  2. A.
    entrainment considerations.
    B.
    vapour density.
    C.
    diameter of the column.
    D.
    none of these.

  3. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

  4. A.
    more
    B.
    less
    C.
    same
    D.
    more or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein.

  5. The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.

  6. A.
    0.1-0.2
    B.
    0.2-0.5
    C.
    0.4-0.9
    D.
    1.2-1.5

  7. Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure ?

  8. A.
    Larger dia vessel.
    B.
    Smaller dia vessel.
    C.
    Larger dia long vessel.
    D.
    Strength of the vessel is same irrespective of the diameter.

  9. Reflux ratio variation in a distillation column is between

  10. A.
    zero and infinity
    B.
    zero and one
    C.
    minimum and infinity
    D.
    none of these

  11. Width and depth of grooves in the tube sheet holes normally are __________ inch respectively.


  12. In condenser, the cooling water is passed in the tube side in a pass arrangement, because

  13. A.
    it reduces heat transfer area.
    B.
    more thinner tubes can be used.
    C.
    pressure drop is reduced.
    D.
    it makes condenser compact.

  14. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

  15. A.
    1/10-1/15th
    B.
    1/5-1/10th
    C.
    1/20-1/30th
    D.
    1/2 to 1/4th

  16. Height of the flights in the rotary drier is in the range of

  17. A.
    0.08 to 0.12 d
    B.
    0.02 to 0.05 d
    C.
    0.2 to 0.5 d
    D.
    0.5 to 0.6 d

  18. Vapor velocity in a distillation column for non-foaming mixture is in the range of __________ times the flooding velocity.

  19. A.
    0.1 to 0.3
    B.
    0.6 to 0.7
    C.
    0.85 to 0.95
    D.
    1.5 to 2