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Chemical Engineering :: Process Equipment and Plant Design

  1. In chemical process equipments, the conical bottom heads used, usually has an apex angle of

  2. A.
    20°
    B.
    40°
    C.
    60°
    D.
    80°

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  3. Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than __________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop.

  4. A.
    25
    B.
    50
    C.
    75
    D.
    150

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  5. Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is

  6. A.
    more
    B.
    same
    C.
    less
    D.
    twice

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  7. Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the

  8. A.
    ultimate stress to breaking stress.
    B.
    ultimate stress to working stress.
    C.
    working stress to ultimate stress.
    D.
    none of these.

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  9. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.

  10. A.
    1-5
    B.
    20-40
    C.
    100-150
    D.
    1000-1500

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  11. __________ tray arrangement is recommended for distillation column having diameter upto 4 ft.

  12. A.
    Radial flow
    B.
    Cross flow
    C.
    Split flow
    D.
    Cascade

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  13. In perforated plate towers, the

  14. A.
    hole sizes may be around 1/8" or 3/16".
    B.
    total hole area may be around 6 to 15% of tower cross-sectional area.
    C.
    pressure drop is less compared is similar bubble cap towers.
    D.
    all (a), (b) and (c).

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  15. The main purpose of providing stepping on the trays is to

  16. A.
    increase the residence time.
    B.
    decrease the pressure drop.
    C.
    facilitate handling of large flow rate of liquid.
    D.
    improve the flow condition.

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  17. The operating pressure drop range in a bag filter is about __________ mm water gauge.

  18. A.
    50-150
    B.
    5-10
    C.
    500-1500
    D.
    1500-2500

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  19. The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.

  20. A.
    Flat plate
    B.
    Hemispherical
    C.
    Torispherical
    D.
    Ellipsoidal

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