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Home ‣ Mechanical Engineering ‣ Hydraulics and Fluid Mechanics Comments
  • Question

  • A flow is called sub-sonic, if the Mach number is


  • Options
  • A. less than unity
  • B. unity
  • C. between 1 and 6
  • D. more than 6

  • Correct Answer
  • less than unity 

    • Hydraulics and Fluid Mechanics problems

    Search Results

    • 1. If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium.

    • Options
    • A. neutral
    • B. stable
    • C. unstable
      • Discuss
    • 2. The rise, in water level, which occurs during the transformation of the unstable shooting flow to the stable streaming flow is called hydraulic jump.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 3. The ratio of the inertia force to the surface tension force is called Weber's number.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 4. The density of air is same at different heights.

    • Options
    • A. Correct.
    • B. Incorrect
      • Discuss
    • 5. The specific weight of water in S.I. units is taken as

    • Options
    • A. 9.81 kN/m3
    • B. 9.81 x 103 kN/m3
    • C. 9.81 x 10-6 N/mm3
    • D. any one of these
      • Discuss
    • 6. The loss of head at exit of a pipe is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. Which of the following statement is correct?

    • Options
    • A. In a compressible flow, the volume of the flowing liquid changes during the flow.
    • B. A flow in which the volume of the flowing liquid does not change, is called incompressible flow.
    • C. When the particles rotate about their own axes while flowing, the flow is said to be rotational flow.
    • D. all of the above
      • Discuss
    • 8. The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

    • Options
    • A. half the depth
    • B. half the breadth
    • C. twice the depth
    • D. twice the breadth
      • Discuss
    • 9. A flow through an expanding tube at increasing rate is called unsteady non-uniform flow.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 10. The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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