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Home Mechanical Engineering Hydraulics and Fluid Mechanics Comments

  • Question
  • A flow is called sonic, if the Mach number is unity.


  • Options
  • A. Agree
  • B. Disagree

  • Correct Answer
  • Agree 


  • Hydraulics and Fluid Mechanics problems


    Search Results


    • 1. Coefficient of velocity is defined as the ratio of

    • Options
    • A. actual velocity of jet at vena contracta to the theoretical velocity
    • B. area of jet at vena contracta to the area of orifice
    • C. actual discharge through an orifice to the theoretical discharge
    • D. none of the above
    • Discuss
    • 2. When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.

    • Options
    • A. sum
    • B. difference
    • C. arithmatic mean
    • D. geometric mean
    • Discuss
    • 3. The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium.

    • Options
    • A. Agree
    • B. Disagree
    • Discuss
    • 4. The surface tension of mercury at normal temperature is __________ that of water.

    • Options
    • A. same as
    • B. lower than
    • C. higher than
    • Discuss
    • 5. A differential manometer is used to measure

    • Options
    • A. atmospheric pressure
    • B. pressure in pipes and channels
    • C. pressure in venturimeter
    • D. difference of pressures between two points in a pipe
    • Discuss
    • 6. The property of a liquid which controls its rate of flow is called viscosity.

    • Options
    • A. True
    • B. False
    • Discuss
    • 7. An error of 1% in measuring head over the crest of the notch (H) will produce an error of __________ in discharge over a triangular notch,

    • Options
    • A. 1%
    • B. 1.5%
    • C. 2%
    • D. 2.5%
    • Discuss
    • 8. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?

    • Options
    • A. The pressure on the wall at the liquid level is minimum.
    • B. The pressure on the bottom of the wall is maximum.
    • C. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
    • D. The pressure on the bottom of the wall is zero.
    • Discuss
    • 9. An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.

    • Options
    • A. less than twice
    • B. more than twice
    • C. less than three times
    • D. more than three times
    • Discuss
    • 10. In case of flow through parallel pipes,

    • Options
    • A. the head loss for all the pipes is same
    • B. the total discharge is equal to the sum of discharges in the various pipes
    • C. the total head loss is the sum of head losses in the various pipes
    • D. Both (A) and (B)
    • Discuss


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