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Chemical Engineering :: Fluid Mechanics

  1. Reciprocating pumps compared to centrifugal pumps

  2. A.

     Deliver liquid at uniform pressure

    B.

     Can handle slurries more efficiently

    C.

     Are not subject to air binding

    D.

     Can be operated with delivery valve closed


  3. Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the

  4. A.

     Temperature

    B.

     Pressure

    C.

     Both A & B

    D.

     Neither A nor B


  5. For pipes that must be broken at intervals for maintenance, the connector used should be a/an

  6. A.

     Union

    B.

     Tee

    C.

     Reducer

    D.

     Elbow


  7. With the increase in depth, the hydrostatic pressure in an unaccelerated incompressible fluid (in a constant gravitational field)

  8. A.

     Decreases

    B.

     Increases linearly

    C.

     Increases exponentially

    D.

     Remains constant


  9. Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an

  10. A.

     Pitot tube

    B.

     Venturimeter

    C.

     Orificemeter

    D.

     Rotameter


  11. While starting a centrifugal pump, its delivery valve should be kept

  12. A.

     Opened

    B.

     Closed

    C.

     Either opened or closed ; it does not make any difference

    D.

     Either opened or closed; depending on the fluid viscosity


  13. While starting an axial flow pump, its delivery valve should be kept

  14. A.

     Open

    B.

     Closed

    C.

     Either open or closed

    D.

     None of these


  15. Pressure drag does not depend upon the

  16. A.

     Roughness of surface of the body

    B.

     Pressure of main flow only

    C.

     Length of the body in flow direction

    D.

     All of the above


  17. The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by(where, x = each side of the square duct)

  18. A.

     x

    B.

     πx

    C.

     2x

    D.

     x/2


  19. Which of the following is the most common pump for pumping either raw sewage or sludge?

  20. A.

     Electromagnetic pump

    B.

     Centrifugal pump

    C.

     Reciprocating pump

    D.

     Gear pump