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  • Question
  • Laminar flow __________ place at very low velocities.


  • Options
  • A. takes
  • B. does not take

  • Correct Answer
  • takes 


  • Hydraulics and Fluid Mechanics problems


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    • 1. 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
    • 2. 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
    • Discuss
    • 3. The unit of dynamic viscosity in S.I. units is

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

    • Options
    • A. Correct
    • B. Incorrect
    • Discuss
    • 5. 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
    • 6. Bulk modulus of a fluid __________ as the pressure increases.

    • Options
    • A. remains same
    • B. decreases
    • C. increases
    • Discuss
    • 7. 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
    • 8. 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
    • 9. A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

    • Options
    • A. length of both the pipes is same
    • B. diameter of both the pipes is same
    • C. loss of head and discharge of both the pipes is same
    • D. loss of head and velocity of flow in both the pipes is same
    • Discuss
    • 10. In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

    • Options
    • A. double
    • B. four times
    • C. eight times
    • D. sixteen times
    • Discuss


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