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  • Question
  • The notch angle for maximum discharge over a triangular notch, is


  • Options
  • A. 30°
  • B. 60°
  • C. 90°
  • D. 120°

  • Correct Answer
  • 90° 


  • Hydraulics problems


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    • 1. The intensity of pressure due to sudden closure of a valve of a pipe in which water flows with velocity v, is directly proportional to :

    • Options
    • A. square root of the bulk modulus of elasticity of water
    • B. bulk modulus of elasticity of water
    • C. specific weight of water
    • D. none of these.
    • Discuss
    • 2. When a liquid rotates at constant angular velocity about a vertical axis of a rigid body, the pressure

    • Options
    • A. increases linearly to its radial distance
    • B. varies inversely as the altitude along any vertical line
    • C. varies as the square of the radial distance
    • D. decreases as the square of the radial distance
    • E. none of these.
    • Discuss
    • 3. Though angle of deviation of liquid is more in internal mouth piece, the contraction of the jet, is

    • Options
    • A. more in the internal mouth piece
    • B. less in the internal mouth piece
    • C. equal to external mouth piece
    • D. none of these.
    • Discuss
    • 4. In C.G.S. system the unit of visocity is

    • Options
    • A. dyne
    • B. joule
    • C. poise
    • D. Newton
    • E. none of these.
    • Discuss
    • 5. Pick up the correct statement from the following :

    • Options
    • A. Discharge over a triangular notch is proportional to H5/2
    • B. Discharge over a rectangular notch is proportional to H3/2
    • C. Both (a) and (b)
    • D. Neither (a) nor (b).
    • Discuss
    • 6. The flow in a channel is said to be non-uniform, if

    • Options
    • A. free water surface of an open channel is not parallel to the bed of channel
    • B. head needed to overcome frictional reistance is less than the drop in elevation of channel bed
    • C. head needed to overcome frictional resistance is more than the drop in elevation of channel bed
    • D. all the above.
    • Discuss
    • 7. The gases are considered incompressible if Match number is

    • Options
    • A. equal to 1.0
    • B. equal to 1.5
    • C. is more than 0.5
    • D. less than 0.2
    • Discuss
    • 8. If H is the depth of water retained by a vertical wall, the height of centre of pressure above the bottom is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 9. To replace a pipe of diameter D by n parallel pipes of diameter d, the formula is

    • Options
    • A.
    • B.
    • C.
    • D.
    • E.
    • Discuss
    • 10. In a short cylindercial external mouthpiece, the venacontracta occurs at a distance from the outlet of orifice equal to

    • Options
    • A. diameter of the orifice
    • B. one-fourth the diameter of the orifice
    • C. one-third the diameter of the orifice
    • D. two-third the diameter of the orifice
    • Discuss


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