Home / Chemical Engineering / Fluid Mechanics :: Section 9

Chemical Engineering :: Fluid Mechanics

  1. Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss ?

  2. A.
    Flow nozzle
    B.
    Venturimeter
    C.
    Rotameter
    D.
    Orificemeter

  3. For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

  4. A.
    V/Vmax = (x/r)1/7
    B.
    V/Vmax = (r/x)1/7
    C.
    V/Vmax = (x.r)1/7
    D.
    none of these

  5. Which of the following has the maximum compression ratio ?

  6. A.
    Blower
    B.
    Compressor
    C.
    Vacuum pump
    D.
    Fan

  7. Scale up of agitator design requires

  8. A.
    geometrical similarity only.
    B.
    dynamic similarity only.
    C.
    both geometrical and dynamic similarity.
    D.
    all geometrical, dynamic and kinematic similarity.

  9. The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by

  10. A.
    Cv . 2gH
    B.
    Cc . 2gH
    C.
    Cd . 2gH
    D.
    Cv . Va

  11. The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe)

  12. A.
    V2
    B.
    1/V2
    C.
    1/V
    D.
    V

  13. Unsteady non-uniform flow is represented by flow through a/an

  14. A.
    long pipe at constant rate.
    B.
    long pipe at decreasing rate.
    C.
    expanding tube at increasing rate.
    D.
    expanding tube at constant rate.

  15. Prandtl number is a measure of the

  16. A.
    heat conduction to viscosity of a fluid.
    B.
    Cp/Cv of a fluid.
    C.
    elastic force to pressure force in the fluid flow.
    D.
    inertial force to elastic force in the fluid flow.

  17. A centrifugal pump has the following specifications:
    Power = 4 H.P.; Speed = 800 rpm
    Head = 8 metres
    Flow = 1000 litres/minutes.
    If its speed is halved, then the new head will be __________ metres.

  18. A.
    2
    B.
    4
    C.
    8
    D.
    5.5

  19. In hindered settling, the particles are

  20. A.
    placed farther from the wall.
    B.
    not affected by other particles and the wall.
    C.
    near each other,
    D.
    none of these.