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Chemical Engineering :: Fluid Mechanics

  1. Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.

  2. A.

     2 to 3

    B.

     0.01 to 0.10

    C.

     200 to 300

    D.

     100 to 1000


  3. Small pressure differences in liquids is measured using a/an

  4. A.

     U-tube manometer

    B.

     Inclined tube manometer

    C.

     Pitot tube

    D.

     None of these


  5. Bernoulli's equation accounts for the

  6. A.

     Various momentums

    B.

     Various masses

    C.

     Different forms of mechanical energy

    D.

     None of these


  7. For steady ideal fluid flow, the Bernoulli's equation states that the

  8. A.

     Velocity is constant along a stream line

    B.

     Energy is constant throughout the fluid

    C.

     Energy is constant along a stream line, but may vary across stream lines

    D.

     None of these


  9. Which of the following is not dimension-less?

  10. A.

     Froude number

    B.

     Kinematic viscosity

    C.

     Pressure co-efficient

    D.

     None of these


  11. Turbulent flow generally occurs for cases involving

  12. A.

     Highly viscous fluid

    B.

     Very narrow passages

    C.

     Very slow motion

    D.

     None of these


  13. Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?

  14. A.

     At the centre

    B.

     At d/4 from the wall

    C.

     At the wall

    D.

     At d/8 from the wall


  15. The ratio of maximum to average velocity in case of streamline flow between parallel plates is

  16. A.

     1

    B.

     1.5

    C.

     2

    D.

     2.5


  17. Pick out the wrong statement.

  18. A.

     The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonion fluids is #####

    B.

     In the equation, the value of

    C.

     Shear stress for Newtonion fluid is proportional to the rate of shear in the direction perpendicular to motion

    D.

     With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids


  19. The pressure head of a flow meter remains constant for

  20. A.

     Venturimeter

    B.

     Orificemeter

    C.

     Rotameter

    D.

     Pitot tube