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  • Question
  • 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

  • Correct Answer
  • less than three times 


  • Hydraulics and Fluid Mechanics problems


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    • 1. 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
    • 2. 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
    • 3. The property of a liquid which controls its rate of flow is called viscosity.

    • Options
    • A. True
    • B. False
    • Discuss
    • 4. A flow is called sonic, if the Mach number is unity.

    • Options
    • A. Agree
    • B. Disagree
    • Discuss
    • 5. 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
    • 6. 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
    • 7. A point, in a compressible flow where the velocity of fluid is zero, is called

    • Options
    • A. critical point
    • B. vena contracta
    • C. stagnation point
    • D. none of these
    • Discuss
    • 8. The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 9. Barometer is used to measure

    • Options
    • A. velocity of liquid
    • B. atmospheric pressure
    • C. pressure in pipes and channels
    • D. difference of pressure between two points in a pipe
    • Discuss
    • 10. The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.

    • Options
    • A. one-half
    • B. one-third
    • C. two-third
    • Discuss


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