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Chemical Engineering :: Process Equipment and Plant Design

  1. Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.

  2. A.
    1.25
    B.
    1.75
    C.
    2.5
    D.
    3.5

  3. Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.

  4. A.
    2.5-3.0
    B.
    5-7.5
    C.
    10-12.5
    D.
    15-20

  5. Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.

  6. A.
    0 to 0.08
    B.
    0 to 0.8
    C.
    0 to 1.5
    D.
    0 to 2.2

  7. In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed __________ of the column diameter.

  8. A.
    l/5th
    B.
    l/15th
    C.
    l/30th
    D.
    l/50th

  9. Seamless pipe is made

  10. A.
    from rolled strips formed into cylinders and seam-welded.
    B.
    by extrusion & casting into static and centrifugal molds.
    C.
    by forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing.
    D.
    both (b) and (c).

  11. The thermal stress in a metallic bar does not depend upon the

  12. A.
    changes in temperature.
    B.
    cross-sectional area.
    C.
    both (a) and (b).
    D.
    neither (a) nor (b).

  13. The minimum baffle height should be

  14. A.
    equal to the impeller diameter.
    B.
    twice the impeller diameter.
    C.
    twice the tank diameter.
    D.
    3/4 of the tank height.

  15. For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec.ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)

  16. A.
    Di, opt = 3.9 Q0.45 ρ0.13
    B.
    Di, opt = 3.9 Q0.45 . μ0.95
    C.
    Di, opt = 4.7 Q0.36 . μ3.2ρ0.13
    D.
    Di, opt = 3 Q0.36 . μ0.88

  17. To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to

  18. A.
    0.5 d
    B.
    d
    C.
    1.5 d
    D.
    2.5 d

  19. The normal range of velocity of water in pipes is __________ m/sec.

  20. A.
    0.1-0.5
    B.
    1-2
    C.
    10-50
    D.
    15-30