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  • Question

  • Flow in pipes is turbulent if Reynold number is


  • Options
  • A. less than 2100
  • B. more than 3000
  • C. between 2100 and 3000
  • D. none of these.

  • Correct Answer
  • more than 3000 

    • Hydraulics problems

    Search Results

    • 1. An ideal fluid is

    • Options
    • A. incompressible
    • B. compressible
    • C. compressible and non-viscous
    • D. slightly affected by surface torque.
      • Discuss
    • 2. In Newton's viscosity equation , the coefficient (?) is known as coefficient of

    • Options
    • A. viscosity
    • B. absolute viscosity
    • C. dynamic viscosity
    • D. simple viscosity
    • E. all the above.
      • Discuss
    • 3. A fluid particle may possess the displacement of

    • Options
    • A. translation
    • B. rotation
    • C. distortion
    • D. all the above.
      • Discuss
    • 4. A non-uniform steady flow is through

    • Options
    • A. a long tube at a decreasing rate
    • B. an expanding tube at constant rate
    • C. an expanding tube at increasing rate
    • D. a long pipe at increasing rate.
      • Discuss
    • 5. A cylindrical vessel 40 cm high is revolved about its vertical axis so that the water touches the bottom when it just spills out. If the radius of the cylinder is 5 cm, the angular velocity of rotation, is

    • Options
    • A. 2 rad/sec
    • B. 3 rad/sec
    • C. 4 rad/sec
    • D. 5 rad/sec
    • E. none of these.
      • Discuss
    • 6. Pick up the correct statement from the following :

    • Options
    • A. When the length of the tube is equal to diameter of the internal mouth piece, the jet of liquid comes out without touching the sides of the tube
    • B. When the length of the tube is three times the diameter of the internal mouth piece, the jet diameter is equal to diameter of the tube.
    • C. both (a) and (b)
    • D. Neither (a) nor (b).
      • Discuss
    • 7. For pipes not running full, the hydraulic mean depth is given by

    • Options
    • A. m = r(? - sin ?)
    • B.
    • C.
    • D.
      • Discuss
    • 8. A jet projected at an angle of 45?, 40 m from the foot of a vertical column, just reaches the top of the column. The height of the column is

    • Options
    • A. 15 m
    • B. 20 m
    • C. 30 m
    • D. 40 m
    • E. 60 m.
      • Discuss
    • 9. To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than

    • Options
    • A. 2.4 m
    • B. 6.4 m
    • C. 10.0 m
    • D. 5.0 m.
      • Discuss
    • 10. Atmospheric pressure varies with

    • Options
    • A. altitude
    • B. temperature
    • C. weather conditions
    • D. all of the above.
      • Discuss

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