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Chemical Engineering :: Process Equipment and Plant Design

  1. In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

  2. A.
    reducing scale deposition.
    B.
    increasing pressure drop.
    C.
    fixing the tubes.
    D.
    creating turbulence.

  3. For turbine agitator, the impeller diameter is about

  4. A.
    0.3 to 0.5 d
    B.
    0.1 to 0.2 d
    C.
    0.65 to 0.85 d
    D.
    0.95 d

  5. In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by


  6. If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will __________ times.

  7. A.
    increase by 1.8
    B.
    decrease by 22
    C.
    increase by 21.6
    D.
    none of these

  8. Pick out the wrong statement.

  9. A.
    An air cooled finned pipe is diagram-matically represented by
    B.
    A heat exchanger is diagrammatically represented by
    C.
    A 90° welded elbow is diagrammatically represented by
    D.
    A pipe still heater is diagrammatically represented by

  10. Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

  11. A.
    Tube dia is 3-6 cms, while tube length in 3-6 metres.
    B.
    Steam is fed to the shell, whereas the liquor is filled inside the tube.
    C.
    Liquor level is maintained at l/3rd to 1/2 of the height of the tube.
    D.
    none of these.

  12. Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger ?

  13. A.
    75% cut segmental baffle.
    B.
    25% cut segmental baffle.
    C.
    Orifice baffle.
    D.
    Disk and doughnut baffle.

  14. What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ?

  15. A.
    6.5 cms
    B.
    6.5 mm
    C.
    Equal to tube I.D
    D.
    Equal to tube O.D

  16. Pick out the correct statement

  17. A.
    Centre to centre distance between two consecutives rivets in a row is called the pitch.
    B.
    A rivetted joint made in overlapping plates is called butt joint.
    C.
    Hole size drilled in rivetted plates is less than the actual size of the rivet.
    D.
    none of these.

  18. Safety valves are provided in chemical equipments to guard against excessive

  19. A.
    temperature
    B.
    pressure/pressure fluctuation
    C.
    turbulence
    D.
    noise