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Home Mechanical Engineering Hydraulics and Fluid Mechanics Comments

  • Question
  • The velocity corresponding to Reynold number of 2800, is called


  • Options
  • A. sub-sonic velocity
  • B. super-sonic velocity
  • C. lower critical velocity
  • D. higher critical velocity

  • Correct Answer
  • higher critical velocity 


  • Hydraulics and Fluid Mechanics problems


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    • 1. The unit of dynamic viscosity in S.I. units is

    • Options
    • A. N-m/s2
    • B. N-s/m2
    • C. poise
    • D. stoke
    • Discuss
    • 2. The viscosity of a liquid is due to cohesion of its particles.

    • Options
    • A. Correct
    • B. Incorrect
    • Discuss
    • 3. An air vessel is provided at the summit in a syphon to

    • Options
    • A. avoid interruption in the flow
    • B. increase discharge
    • C. increase velocity
    • D. maintain pressure difference
    • Discuss
    • 4. A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 5. The length of the divergent cone in a venturimeter is __________ that of the convergent cone.

    • Options
    • A. equal to
    • B. double
    • C. three to four times
    • D. five to six times
    • Discuss
    • 6. A flow in which the viscosity of fluid is dominating over the inertia force is called

    • Options
    • A. steady flow
    • B. unsteady flow
    • C. laminar flow
    • D. turbulent flow
    • Discuss
    • 7. Laminar flow __________ place at very low velocities.

    • Options
    • A. takes
    • B. does not take
    • Discuss
    • 8. Bulk modulus of a fluid __________ as the pressure increases.

    • Options
    • A. remains same
    • B. decreases
    • C. increases
    • Discuss
    • 9. The Newton's law of resistance is based on the assumption that the

    • Options
    • A. planes of the body are completely smooth
    • B. space around the body is completely filled with the fluid
    • C. fluid particles do not exert any influence on one another
    • D. all of the above
    • Discuss
    • 10. When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

    • Options
    • A. steady flow
    • B. turbulent flow
    • C. vortex flow
    • D. uniform flow
    • Discuss


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