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Chemical Engineering :: Process Equipment and Plant Design

  1. Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

  2. A.
    Sorel-Lewis method.
    B.
    McCabe-Thiele's method.
    C.
    Ponchon-Savarit method.
    D.
    none of these.

  3. Saddle supports are used for supporting __________ vessels.

  4. A.
    horizontal cylinderical
    B.
    tall vertical
    C.
    thick walled vertical
    D.
    thick spherical

  5. The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute.

  6. A.
    5 to 10
    B.
    15 to 30
    C.
    40 to 50
    D.
    55 to 75

  7. In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.

  8. A.
    2-3
    B.
    5-8
    C.
    10-15
    D.
    20-25

  9. Optimum reflux ratio in a continuous distillation column is determined by the

  10. A.
    maximum permissible vapour velocity.
    B.
    flooding limit of the column.
    C.
    total cost consideration (fixed cost of the column plus the cooling water & steam cost).
    D.
    none of these.

  11. Cooling water fouling factors vary in the range of 0.001 to 0.003

  12. A.
    (BTU/hr.ft2 . °F)-1
    B.
    (kcal/hr.m2 .°C)-1
    C.
    (W/m2.°K)-1
    D.
    (kcal/hr. m. °C)-1

  13. Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter )

  14. A.
    0.2 D
    B.
    0.5 D
    C.
    0.66 D
    D.
    0.80 D

  15. The maximum liquid gradient over a tray must not exceed

  16. A.
    0.5" -1.25".
    B.
    2"-3.5".
    C.
    5".
    D.
    half the tray spacing.

  17. An underdesigned steam trap will

  18. A.
    waste steam.
    B.
    destroy itself of acceleration wear due to rapid recycling.
    C.
    back up condensate and cause water hammer in steam line.
    D.
    none of these.

  19. The slope of the feed line in distillation opeartion is given by (where, q = fraction of the feed stream that is liquid.)

  20. A.
    -q
    B.
    -q/(1-q)
    C.
    -q/(q-1)
    D.
    none of these