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  • Question

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


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

  • Correct Answer
  • 0.6 to 0.7 

    • Process Equipment and Plant Design problems

    Search Results

    • 1. The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.

    • Options
    • A. 5
    • B. 15
    • C. 7.5
    • D. 50
      • Discuss
    • 2. For high pressure process equipments/vessels, the connected nozzle should be

    • Options
    • A. welded
    • B. screwed
    • C. flanged
    • D. brazed
      • Discuss
    • 3. The function of manholes provided in the shell of a distillation column is to

    • Options
    • A. keep a check on the liquid gradient over the plate by direct visual observation.
    • B. give access to the individual trays for cleaning, maintenance and installation.
    • C. guard against foaming & entrainment by dumping antifoaming agent through it.
    • D. all (a), (b) and (c).
      • Discuss
    • 4. The thermal stress in a metallic bar does not depend upon the

    • Options
    • A. changes in temperature.
    • B. cross-sectional area.
    • C. both (a) and (b).
    • D. neither (a) nor (b).
      • Discuss
    • 5. Stress-strain diagram for low carbon steel/mild steel is shown below in the Fig.

      The point 'A' on the Fig. represents the

    • Options
    • A. breaking stress
    • B. ultimate stress
    • C. elastic limit
    • D. yield point
      • Discuss
    • 6. Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

    • Options
    • A. 1/10th
    • B. 1/20th
    • C. 1/30th
    • D. 1/50th
      • Discuss
    • 7. The minimum plate spacing in most of the pertroleum refinery distillation columns (of dia > 3 ft) is normally __________ inches.

    • Options
    • A. 6
    • B. 12
    • C. 18
    • D. 34
      • Discuss
    • 8. In inclined long tube vertical evaporators, the tubes are inclined at an angle of

    • Options
    • A. 15°
    • B. 90°
    • C. 45°
    • D. 60°
      • Discuss
    • 9. A cylindrical storage tank can have a self supported conical roof,

    • Options
    • A. if its diameter is less than 15-20metres.
    • B. if its diameter is more than 50 meters.
    • C. if the thickness of the roof is more than that of the cylindrical shell.
    • D. irrespective of its diameter.
      • Discuss
    • 10. Lap joints are preferred for plates having thickness __________ mm.

    • Options
    • A. < 12.5
    • B. > 3
    • C. > 5
    • D. 5-10
      • Discuss

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