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Chemical Engineering :: Process Equipment and Plant Design

  1. The distance between the centre of a rivet hole to the nearest edge of the plate is called

  2. A.
    pitch
    B.
    margin
    C.
    back pitch
    D.
    none of these

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  3. Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the

  4. A.
    sensible heat differences are small, because the temperature changes from tray to tray is small.
    B.
    Trouton's rule is applicable.
    C.
    liquid/vapor loading across the column remains constant.
    D.
    all (a), (b) and (c).

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  5. A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.

  6. A.
    19
    B.
    38
    C.
    76
    D.
    95

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  7. Pick out the wrong statement.

  8. A.
    If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour.
    B.
    The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding.
    C.
    The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps.
    D.
    none of these.

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

  10. A.
    Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle.
    B.
    Baffles are supported independently of the tubes by tie rods and positioned by spacers.
    C.
    Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter.
    D.
    Bracket supports are used for horizontal shell, while saddle support is used for vertical shell.

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  11. Wind load consideration in the design of a support can be neglected, when the vessel is

  12. A.
    tall (say 30 metres), but is full of liquid.
    B.
    tall but empty.
    C.
    short (< 2 m) and housed indoor.
    D.
    none of these.

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  13. Souders Brown equation given by, , is used for the calculation of the __________ in a continuous distillation column.

  14. A.
    diameter of the bubble cap column
    B.
    diameter of the seive plate column
    C.
    tray pressure drop
    D.
    residence time in the downcomer for the disengagement of entrained vapour

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  15. The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always

  16. A.
    1
    B.
    < 1
    C.
    >1
    D.
    equal to the order of reaction

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  17. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation

  18. A.
    increases capacity.
    B.
    increases economy.
    C.
    does not affect the capacity.
    D.
    both 'b' & 'c'.

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  19. for a Tee (used as elbow, entering run) would be around

  20. A.
    5
    B.
    60
    C.
    200
    D.
    350

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