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Chemical Engineering :: Process Equipment and Plant Design

Process Equipment and Plant Design - Section 1
Process Equipment and Plant Design - Section 2
Process Equipment and Plant Design - Section 3
Process Equipment and Plant Design - Section 4
Process Equipment and Plant Design - Section 5
Process Equipment and Plant Design - Section 6
Process Equipment and Plant Design - Section 7
Process Equipment and Plant Design - Section 8

  1. The minimum plate spacing in most of the pertroleum refinery distillation columns (of dia > 3 ft) is normally __________ inches.

    2. A.
    6
    B.
    12
    C.
    18
    D.
    34

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  2. Joint efficiency (J) for a seamless pipe is

    3. A.
    1
    B.
    0.85
    C.
    1.2
    D.
    < 0.5

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  3. For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

    4. A.
    allowable gas velocity through the slots.
    B.
    plate spacing.
    C.
    diameter of the column.
    D.
    all (a), (b) and (c).

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  4. The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.

    5. A.
    disk and ring
    B.
    segmental
    C.
    orifice
    D.
    independent of the type of

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  5. The function of manholes provided in the shell of a distillation column is to

    6. 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).

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  6. Back-trapping in a distillation column results due to

    7. A.
    low gas velocity.
    B.
    high gas velocity.
    C.
    excessive liquid gradient over the tray.
    D.
    low reflux ratio.

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  7. For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used ?

    8. A.
    0.8
    B.
    0.9
    C.
    1.0
    D.
    (0.8)0.5

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  8. Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.

    9. A.
    less
    B.
    more
    C.
    same
    D.
    either (a) or (b); no generalisation can be made

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

    10. A.
    5
    B.
    15
    C.
    7.5
    D.
    50

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  10. Lap joints are preferred for plates having thickness __________ mm.

    11. A.
    < 12.5
    B.
    > 3
    C.
    > 5
    D.
    5-10

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