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Chemical Engineering :: Process Equipment and Plant Design

  1. Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).

  2. A.
    250
    B.
    450
    C.
    650
    D.
    750

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  3. Which of the following is the best tube material from thermal conductivity point of view alone?

  4. A.
    Aluminium
    B.
    Stainless steel
    C.
    Copper
    D.
    Carbon steel

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  5. Normal screwed fittings are used for pipes upto a diameter of __________ inches.

  6. A.
    1.5
    B.
    3
    C.
    5
    D.
    7

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  7. In a shell and tube heat exchanger, the clearance of the tube is generally

  8. A.
    not less than one-fourth of the tube diameter or 3/16".
    B.
    more than the tube diameter.
    C.
    equal to the tube diameter.
    D.
    more in case of triangular pitch as compared to the square pitch tube layout.

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  9. Diameter of the seive tray column is determined by the

  10. A.
    lower limit of vapour velocity.
    B.
    upper limit of the vapour velocity.
    C.
    hole diameter of the seive tray.
    D.
    height of the plate spacing.

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  11. For a given fluid, as the pipe diameter increases, the pumping cost

  12. A.
    decreases.
    B.
    increases.
    C.
    remains unaffected.
    D.
    may increase or decreaes depending upon whether the fluid is Newtonian or non-Newtonion.

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  13. Maximum acceptable total liquid gradient over a tray is about __________ mm.

  14. A.
    5.5
    B.
    12.5
    C.
    30.5
    D.
    45.5

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  15. In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is

  16. A.
    < 10
    B.
    > 10
    C.
    > 20
    D.
    30

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  17. High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

  18. A.
    tubes to avoid the expansion of high pressure shell construction.
    B.
    shell side for smaller total pressure drop.
    C.
    shell side, if the flow is counter-current and tube side if the flow is co-current.
    D.
    shell side for large overall heat transfer co-efficient.

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  19. Bubble cap tray is the most commonly used tray in large distillation column, because

  20. A.
    of its flexibility and nearly constant efficiency under varying conditions of operation.
    B.
    it incurs less pressure drop as compared to any other try designed for the same duty.
    C.
    it eliminates the foaming and entrain-ment tendency during operation.
    D.
    none of these.

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