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  • Question
  • Water hammer in a pipeline results from the


  • Options
  • A. bursting of pipelines due to closure by a valve.
  • B. rapid pressure change due to a rapid change in the rate of flow.
  • C. pressure increase due to closure of a valve resulting in decrease in rate of flow.
  • D. none of these.

  • Correct Answer
  • rapid pressure change due to a rapid change in the rate of flow. 


  • Fluid Mechanics problems


    Search Results


    • 1. At high Reynolds number

    • Options
    • A. inertial forces control and viscous forces are unimportant.
    • B. viscous forces predominate.
    • C. inertial forces are unimportant and viscous forces control.
    • D. none of these.
    • Discuss
    • 2. All pipes of a particular nominal size have the same

    • Options
    • A. inside diameter
    • B. outside diameter
    • C. thickness
    • D. none of these
    • Discuss
    • 3. Head developed by a centrifugal pump depends on its

    • Options
    • A. speed
    • B. impeller diameter
    • C. both (a) and (b)
    • D. neither (a) nor (b)
    • Discuss
    • 4. In fluid flow, cavitation is caused, if the

    • Options
    • A. fluid velocity decreases to zero.
    • B. total energy decreases.
    • C. both (a) and (b).
    • D. flow pressure approaches its vapor pressure at the prevailing temperature.
    • Discuss
    • 5. Dimension of surface tension is(where, F = force, L = length)

    • Options
    • A. FL-1
    • B. F-1 . L
    • C. F.L-2
    • D. F-2 . L
    • Discuss
    • 6. Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.

    • Options
    • A. 2 to 3
    • B. 0.01 to 0.10
    • C. 200 to 300
    • D. 100 to 1000
    • Discuss
    • 7. Pressure drag does not depend upon the

    • Options
    • A. roughness of surface of the body.
    • B. pressure of main flow only.
    • C. length of the body in flow direction.
    • D. all (a), (b) and (c)
    • Discuss
    • 8. With increasing flow rate, the hydraulic efficiency of a centrifugal pump

    • Options
    • A. monotonically decreases.
    • B. decreases and then increases.
    • C. remains constant.
    • D. increases and then decreases.
    • Discuss
    • 9. The fluid property, due to which, mercury does not wet the glass is

    • Options
    • A. surface tension
    • B. viscosity
    • C. cohesion
    • D. adhesion
    • Discuss
    • 10. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

    • Options
    • A. relative roughness.
    • B. absolute roughness.
    • C. friction co-efficient for flows at equal Reynold number.
    • D. all (a), (b) & (c).
    • Discuss


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