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  • Question
  • Pick out the correct statement.


  • Options
  • A. A forced vortex occurs when fluid rotates as a solid about an axis.
  • B. In laminar flow, Newton's law of viscosity does not apply.
  • C. A free vortex occurs, when fluidrotates as a solid.
  • D. In turbulent flow, there are neither cross-currents nor eddies.

  • Correct Answer
  • A forced vortex occurs when fluid rotates as a solid about an axis. 


  • Fluid Mechanics problems


    Search Results


    • 1. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

    • Options
    • A. 0.5
    • B. 1
    • C. 1.5
    • D. 2
    • Discuss
    • 2. Dimension of absolute viscosity is

    • Options
    • A. ML-1T-1
    • B. MLT-1
    • C. ML-1T
    • D. MLT
    • Discuss
    • 3. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.

    • Options
    • A. Bingham
    • B. Newtonion
    • C. perfect
    • D. none of these
    • Discuss
    • 4. 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
    • 5. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

    • Options
    • A. 4000
    • B. 2100
    • C. 1500
    • D. 3000
    • Discuss
    • 6. Foot valves provided in pumps are __________ valves.

    • Options
    • A. relief
    • B. three/four way
    • C. pressure reducing
    • D. directional control
    • Discuss
    • 7. The distribution given by microscopic analysis of powder is

    • Options
    • A. number
    • B. length
    • C. area
    • D. volume
    • Discuss
    • 8. If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is ?s is defined by

    • Options
    • A. ?s = 6 Vp/dp sp
    • B. ?s = Vp/dp sp
    • C. ?s = 6 dp Sp/Vp
    • D. ?s = dp Sp/Vp
    • Discuss
    • 9. Pick out the wrong statement.

    • Options
    • A. Close circuit grinding is more economical than open circuit grinding.
    • B. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement 'industries'.
    • C. The equipment used for the removal of traces of solids from a liquid is called a classifier.
    • D. Size enlargement is a mechanical operation exemplified by medicinal tablet making.
    • Discuss
    • 10. Which of the following is a pressure filter?

    • Options
    • A. Leaf filter (Moore filter).
    • B. Plate and flame filter.
    • C. Rotary drum filter.
    • D. Sand filter.
    • Discuss


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