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Chemical Engineering :: Process Equipment and Plant Design

  1. The equivalent diameter for pressure drop is __________ that for heat transfer.

  2. A.
    smaller than
    B.
    greater than
    C.
    equal to
    D.
    not related with

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  3. Most of the storage vessels/tanks are made cylindrical, because of the fact that a cylinder

  4. A.
    has greater structural strength.
    B.
    is easy to fabricate.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

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  5. The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

  6. A.
    downcomer liquid seal
    B.
    static submergence
    C.
    skirt clearance
    D.
    none of these

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  7. Liquid gradient over the tray results due to the

  8. 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.

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  9. The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles ?

  10. A.
    To increase the residence time of shell side fluid.
    B.
    To provide support to the tube bundle.
    C.
    To reduce the induced vibration in the tubes.
    D.
    To increase the tube side heat transfer co-efficient by inducing turbulence.

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  11. A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.

  12. A.
    45
    B.
    60
    C.
    80
    D.
    95

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  13. The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)

  14. A.
    0.5 d
    B.
    0.75 d
    C.
    d
    D.
    2 d

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  15. Baffle width is normally taken as __________ times the tank diameter.

  16. A.
    0.1-0.12
    B.
    0.4-0.5
    C.
    0.45-0.6
    D.
    0.2-0.45

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  17. A cylinderical pressure vessel of volume 6 πm3 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

  18. A.
    5 mm
    B.
    6 mm
    C.
    8 mm
    D.
    10 mm

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  19. Which of the following packing materials provides for maximum mass transfer ?

  20. A.
    Lessig rings.
    B.
    Raschig rings.
    C.
    Cross-partition rings.
    D.
    All give the same value.

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