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  • Question
  • 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

  • Correct Answer
  • as (velocity)2 


  • Fluid Mechanics problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. The fluid property, due to which, mercury does not wet the glass is

    • Options
    • A. surface tension
    • B. viscosity
    • C. cohesion
    • D. adhesion
    • Discuss
    • 5. 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
    • 6. 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
    • 7. The terminal velocity of a small sphere settling in a viscous fluid varies as the

    • Options
    • A. first power of its dimeter.
    • B. inverse of the fluid viscosity.
    • C. inverse square of the diameter.
    • D. square of the difference in specific weights of solid & fluid.
    • Discuss
    • 8. Which of the following is not concerned with the fluid-particle interaction?

    • Options
    • A. Drag co-efficient
    • B. Froude number
    • C. Galileo number
    • D. Weber number
    • Discuss
    • 9. For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

    • Options
    • A. Vs/Dp2
    • B. Vs2/Dp2
    • C. Vs2/Dp3
    • D. Vs/Dp3
    • Discuss
    • 10. Shear stress in a fluid flowing in a round pipe

    • Options
    • A. varies parabolically across the cross-section.
    • B. remains constant over the cross-section.
    • C. is zero at the centre and varies linearly with the radius.
    • D. is zero at the wall and increases linearly to the centre.
    • Discuss


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