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Home Chemical Engineering Fluid Mechanics Comments

  • Question
  • The fluid property, due to which, mercury does not wet the glass is


  • Options
  • A. surface tension
  • B. viscosity
  • C. cohesion
  • D. adhesion

  • Correct Answer
  • surface tension 


  • Fluid Mechanics problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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.
    • Discuss
    • 5. 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
    • 6. 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
    • 7. Pick out the wrong statement.

    • Options
    • A. Momentum transfer in laminar flow results from veclocity gradient.
    • B. A fluid in equilibrium is not free from shear stress.
    • C. The viscosity of a non-Newtonion fluid is a function of temperature only.
    • D. both (b) and (c)
    • Discuss
    • 8. For a particle settling in water at its terminal settling velocity, which of the following is true?

    • Options
    • A. Buoyancy = weight + drag
    • B. Weight = buoyancy + drag
    • C. Drag = buoyancy + weight
    • D. Drag = weight
    • Discuss
    • 9. The head loss in turbulent flow in a pipe varies

    • Options
    • A. as velocity
    • B. as (velocity)2
    • C. inversely as the square of diameter
    • D. inversely as the velocity
    • Discuss
    • 10. Power loss in an orificemeter is __________ that in a venturimeter.

    • Options
    • A. less than
    • B. same as
    • C. more than
    • D. data insufficient, cannot be predicted
    • Discuss


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