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Chemical Engineering :: Process Equipment and Plant Design

  1. Value of Peclet number = 0, is the representative of

  2. A.
    laminar flow.
    B.
    complete back mixing.
    C.
    plug flow.
    D.
    eddy diffusivity = 0.

  3. Poisson's ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson's ratio for structural and pressure vessel steel may be taken as

  4. A.
    0.01
    B.
    0.3
    C.
    0.75
    D.
    0.95

  5. Removable connection of tubes to tube sheet is called

  6. A.
    ferrule
    B.
    socket
    C.
    nipple
    D.
    saddle

  7. Stress-strain diagram for low carbon steel/mild steel is shown below in the Fig.

    The point 'A' on the Fig. represents the

  8. A.
    breaking stress
    B.
    ultimate stress
    C.
    elastic limit
    D.
    yield point

  9. Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around

  10. A.
    2.5"
    B.
    0.5"
    C.
    5"
    D.
    50% of the plate spacing

  11. In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a

  12. A.
    clearance of 25-75 mm.
    B.
    cap pitch of 1.3-2 times the cap diameter.
    C.
    either 'a' or 'b'.
    D.
    neither 'a' nor 'b'.

  13. The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.

  14. A.
    0.6-0.8 times
    B.
    equal to
    C.
    twice
    D.
    2 ft irrespective of (for column > 3 ft diameter)

  15. for couplings and unions would be

  16. A.
    60
    B.
    200
    C.
    350
    D.
    negligible

  17. Stage efficiency for packed tower varies with the

  18. A.
    type & size of packing.
    B.
    fluid rates and fluid properties.
    C.
    operating pressure and column diameter.
    D.
    all (a), (b) and (c).