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  • Question

  • If the straight sides of a triangular section of a lined canal with circular bottom of radius D, make an angle ? with horizontal, the hydraulic mean depth is


  • Options
  • A. D
  • B. D/2
  • C. D/3
  • D. D/4
  • E. D/5

  • Correct Answer
  • D/2 

    • Irrigation problems

    Search Results

    • 1. In a concrete canal the approximate permissible velocity of water should not exceed

    • Options
    • A. 0.5 m/sec
    • B. 1 m/sec
    • C. 1.5 m/sec
    • D. 2 m/sec
    • E. 2.5 m/sec
      • Discuss
    • 2. To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls

    • Options
    • A. of R.C.C. or steel plate 8 cm thick
    • B. of height l/3rd to l/4th the depth of water in the main canal
    • C. spaced at interval of times their heights
    • D. extending about one metre beyond a line drawn at an inclination of 2 : 1 to the axis of main canal
    • E. all the above.
      • Discuss
    • 3. The water face of the guide banks, is protected by

    • Options
    • A. one men stone pitching
    • B. two man stone pitching
    • C. three man stone pitching
    • D. four man stone pitching
    • E. five man stone pitching.
      • Discuss
    • 4. The ratio of the head recovered to the head put in, is known as

    • Options
    • A. efficiency
    • B. sensitivity
    • C. flexibility
    • D. modular limit.
      • Discuss
    • 5. If average particle size of the silt in millimetres is m, the Lacey's silt factor f is proportional to

    • Options
    • A. m
    • B. m3
    • C. m1/2
    • D. m1/3
    • E. m2/3
      • Discuss
    • 6. The ratio of the rate of change of discharge of an outlet and parent channel, is known as

    • Options
    • A. efficiency
    • B. sensitivity
    • C. flexibility
    • D. modular limit.
      • Discuss
    • 7. Finally formed berms in canals are provided for

    • Options
    • A. protection of banks erosion by the waves
    • B. control of seepage losses
    • C. strengthening of banks
    • D. all the above.
      • Discuss
    • 8. V and R are the regime mean velocity and hydraulic mean depth respectively in metres. Lacey's silt factor f is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is

    • Options
    • A. 1.25 D
    • B. 1.50 D
    • C. 1.75 D
    • D. 2.00 D
      • Discuss
    • 10. An outlet is said to be proportional if its flexibility, is

    • Options
    • A. zero
    • B. less than one
    • C. more than one
    • D. one
      • Discuss

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