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Chemical Engineering :: Process Equipment and Plant Design

  1. The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.

  2. A.
    6
    B.
    18
    C.
    24
    D.
    34

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  3. Oxygen carrying pipelines in chemical industries are coloured with __________ colour.

  4. A.
    yellow
    B.
    black
    C.
    blue
    D.
    red

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  5. Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around

  6. A.
    0.4-0.6
    B.
    0.35-0.75
    C.
    0.1-0.2
    D.
    0.55-0.85

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  7. Pick out the wrong statement about the design of seive plate column and the bubble cap column.

  8. A.
    The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns.
    B.
    Weir length for a bubble cap plate is the same as that for the seive plate.
    C.
    Weir height for a bubble cap plate column is the same as that for a seive plate column.
    D.
    Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate.

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  9. Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

  10. A.
    1/10th
    B.
    1/20th
    C.
    1/30th
    D.
    1/50th

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  11. Longitundinal stress induced in a thin walled cylindrical storage vessel is

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  13. The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.

  14. A.
    shear
    B.
    tensile
    C.
    compressive
    D.
    thermal

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  15. The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about __________ kms.

  16. A.
    1
    B.
    5
    C.
    15
    D.
    25

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  17. Pick out the wrong statement pertaining to a shell and tube heat exchanger.

  18. A.
    The minimum value of baffle spacing is 50 mm.
    B.
    The maximum value of baffle spacing is equal to the I.D. of the shell.
    C.
    The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these.
    D.
    Disk and doughnut baffle is the most commonly used baffle.

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  19. Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

  20. A.
    plain carbon steel and cast iron parts are used.
    B.
    wall thickness is > 30 mm.
    C.
    material of construction is high alloy steel.
    D.
    both(b) & (c).

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