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Chemical Engineering :: Process Equipment and Plant Design

  1. __________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.

  2. A.
    Sieve plate
    B.
    Packed
    C.
    Bubble cap plate
    D.
    None of these

  3. At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.

  4. A.
    higher
    B.
    lower
    C.
    same
    D.
    unpredictable

  5. The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the __________ stress.

  6. A.
    yield point
    B.
    breaking
    C.
    ultimate
    D.
    none of these

  7. Baffle spacing is generally __________ the I.D. of the shell.

  8. A.
    more than
    B.
    not greater than
    C.
    not less than one fifth of
    D.
    both (b) and (c)

  9. The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.

  10. A.
    equal to
    B.
    more than
    C.
    less than
    D.
    either (b) or (c); depends on maximum permissible internal pressure

  11. A 'rupture disc' is provided in chemical equipments as an accessory meant for

  12. A.
    relieving excess pressure.
    B.
    creating turbulence.
    C.
    enhancing mixing rate.
    D.
    avoiding vortex formation.

  13. In a vertical short tube evaporator (Calendria type), the

  14. A.
    tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used.
    B.
    area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube.
    C.
    liquor is inside the tube while the steam is outside the tube.
    D.
    all (a), (b) & (c).

  15. In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a

  16. A.
    U-bend
    B.
    floating head tube sheet
    C.
    either (a) or (b)
    D.
    neither (a) nor (b)

  17. In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is

  18. A.
    called tube pitch.
    B.
    called tube clearance.
    C.
    always less than the diameter of the tube.
    D.
    none of these.

  19. Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of

  20. A.
    preventing the local overstressing of the shell around the opening.
    B.
    reduction of discontinuity in shape at the junction.
    C.
    making the joint leak proof.
    D.
    none of these.