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  • Question

  • Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.


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

  • Correct Answer
  • floating 

    • Process Equipment and Plant Design problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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.
      • Discuss
    • 6. Lug support is meant for supporting __________ vessels.

    • Options
    • A. large horizontal cylindrical
    • B. tall but empty
    • C. small
    • D. thick walled tall
      • Discuss
    • 7. Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid

    • Options
    • A. containing suspended solids flows at low velocity.
    • B. containing suspended solids flows at high velocity.
    • C. is highly viscous.
    • D. is of high specific gravity.
      • Discuss
    • 8. Pick out the wrong statement.

    • Options
    • A. In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used.
    • B. Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing.
    • C. In a seive tray, the minimum hole diameter is equal to the tray thickness.
    • D. In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness.
      • Discuss
    • 9. Which of the following packing materials provides for maximum mass transfer?

    • Options
    • A. Lessig rings.
    • B. Raschig rings.
    • C. Cross-partition rings.
    • D. All give the same value.
      • Discuss
    • 10. Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as

    • Options
    • A. d = 1.1 t
    • B. d = 1.6 t
    • C. d = 1.5 t
    • D. 3t
      • Discuss

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