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Chemical Engineering :: Process Equipment and Plant Design

  1. Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.

  2. A.
    10
    B.
    20
    C.
    30
    D.
    5

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  3. Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.

  4. A.
    0.1 to 0.25
    B.
    0.3 to 0.5
    C.
    0.5 to 0.6
    D.
    0.65 to 0.80

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  5. In a __________ rivetted joint, the rivets in the various rows are opposite to each other.

  6. A.
    zig-zag
    B.
    chain
    C.
    diamond
    D.
    none of these

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  7. Pick out the wrong statement:

  8. A.
    The tensile strength of a brittle material is less than its compressive strength.
    B.
    The compressive strength of a ductile materia] is less than its tensile strength.
    C.
    In a thick cylindrical shell, the hoop stress is maximum at the inner radius.
    D.
    The value of crushing load is more than that of buckling load for long colmns.

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  9. Generally, elliptical dished heads

  10. A.
    are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m2 .
    B.
    resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter.
    C.
    are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D.
    D.
    all (a), (b) and (c)

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  11. Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.

  12. A.
    Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution.
    B.
    Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids.
    C.
    The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty.
    D.
    In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes.

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  13. The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is

  14. A.
    pd/2t
    B.
    pd/4t
    C.
    pd/t
    D.
    pd/3t

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  15. for fully open gate valves would be

  16. A.
    much more than that for fully open globe valves.
    B.
    much less (say 2% than that for fully open globe valves).
    C.
    around 7.
    D.
    both (b) and (c).

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  17. LMTD correction factor is used in heat exchanger design for

  18. A.
    double pipe heat exchanger.
    B.
    multipass shell and tube heat exchanger.
    C.
    fouling fluids.
    D.
    counter flow of hot and cold fluids.

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  19. Floating head heat exchangers are used for the

  20. A.
    heat transfer between corrosive fluids.
    B.
    cases where temperature difference between the shell and the tubes is more (>50°C).
    C.
    co-current heat transfer systems.
    D.
    counter-current heat transfer systems.

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