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  • Question
  • 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.

  • Correct Answer
  • inverse of the fluid viscosity. 


  • Fluid Mechanics problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

    • Options
    • A. 4000
    • B. 2100
    • C. 1500
    • D. 3000
    • Discuss
    • 10. The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime?

    • Options
    • A. 0.5
    • B. 1
    • C. 1.5
    • D. 3
    • Discuss


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