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  • Question

  • Liquid gradient over the tray results due to the


  • Options
  • A. resistance offered to flow of liquids by caps & risers and the flow of gas.
  • B. low gas velocity.
  • C. large plate spacing.
  • D. large reflux ratio.

  • Correct Answer
  • resistance offered to flow of liquids by caps & risers and the flow of gas. 

    • Process Equipment and Plant Design problems

    Search Results

    • 1. What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?

    • Options
    • A. 6.5 cms
    • B. 6.5 mm
    • C. Equal to tube I.D
    • D. Equal to tube O.D
      • Discuss
    • 2. In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?

    • Options
    • A. Long tube vertical evaporator
    • B. Short tube vertical evaporator
    • C. Horizontal tube evaporator
    • D. None of these
      • Discuss
    • 3. Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?

    • Options
    • A. 75% cut segmental baffle.
    • B. 25% cut segmental baffle.
    • C. Orifice baffle.
    • D. Disk and doughnut baffle.
      • Discuss
    • 4. In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

    • Options
    • A. 0.5 to 1.5
    • B. 2.5 to 4.0
    • C. 5 to 10
    • D. 10 to 15
      • Discuss
    • 5. Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

    • Options
    • A. Tube dia is 3-6 cms, while tube length in 3-6 metres.
    • B. Steam is fed to the shell, whereas the liquor is filled inside the tube.
    • C. Liquor level is maintained at l/3rd to 1/2 of the height of the tube.
    • D. none of these.
      • Discuss
    • 6. The force due to wind load acting on a tall vessel depends upon its

    • Options
    • A. shape.
    • B. outside diameter.
    • C. height.
    • D. all (a), (b) & (c).
      • Discuss
    • 7. Pick out the wrong statement.

    • Options
    • A. An air cooled finned pipe is diagram-matically represented by
    • B. A heat exchanger is diagrammatically represented by
    • C. A 90° welded elbow is diagrammatically represented by
    • D. A pipe still heater is diagrammatically represented by
      • Discuss
    • 8. The safe height (h) to diameter (d) ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kilolitres is less than

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 3.5
      • Discuss
    • 9. A cylinderical pressure vessel of volume 6 ?m3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to

    • Options
    • A. 5 mm
    • B. 6 mm
    • C. 8 mm
    • D. 10 mm
      • Discuss
    • 10. Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.

    • Options
    • A. conical
    • B. flat
    • C. floating
    • D. fixed
      • Discuss

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