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  • Question

  • If the irrigation efficiency is 80%, conveyance losses are 20% and the actual depth of watering is 16 cm, the depth of water required at the canal outlet, is


  • Options
  • A. 10 cm
  • B. 15 cm
  • C. 20 cm
  • D. 25 cm
  • E. 30 cm

  • Correct Answer
  • 25 cm 

    • Irrigation problems

    Search Results

    • 1. According to Khosla, the exist gradient of surface flow

    • Options
    • A. depends upon the b/d ratio
    • B. is independent of the b/d ratio
    • C. is independent of the depths of d/s cut off walls
    • D. none of these.
      • Discuss
    • 2. The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

    • Options
    • A. 30°
    • B. 45°
    • C. 60°
    • D. 90°
      • Discuss
    • 3. If V0 is the critical velocity of a channel, its silt transporting power, according to Kennedy, is proportional to

    • Options
    • A.
    • B.
    • C.
    • D.
    • E.
      • Discuss
    • 4. A fall in a canal bed is generally provided, if

    • Options
    • A. ground slope exceeds the designed bed slope
    • B. designed bed slope exceeds the ground slope
    • C. ground slope is practically the same as the designed bed slope
    • D. none of these.
      • Discuss
    • 5. If the optimum depth of kor watering for a crop is 15.12 cm, the outlet factor for the crop for four week period in hectares per cumec, is

    • Options
    • A. 1000
    • B. 1200
    • C. 1400
    • D. 1600
    • E. 2000
      • Discuss
    • 6. In Montague type fall

    • Options
    • A. a straight glacis is provided
    • B. a circular glacis is provided
    • C. a parabolic glacis is provided
    • D. no glacis is provided.
      • Discuss
    • 7. A hydraulic structure is designed to withstand

    • Options
    • A. seepage forces
    • B. hydraulic jump
    • C. hydraulic pressure
    • D. all the above.
      • Discuss
    • 8. Useful soil moisture for plant growth, is

    • Options
    • A. capillary water
    • B. gravity water
    • C. hygroscopic water
    • D. chemical water
    • E. all the above.
      • Discuss
    • 9. Solution of Laplacian equation in three dimensions of water in a syphon, is done by

    • Options
    • A. analytical method
    • B. Khosla's method
    • C. method of relaxation
    • D. Unwin's method.
      • Discuss
    • 10. If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

    • Options
    • A. Q = 1.71 BD1/2
    • B. Q = 1.71 BD
    • C. Q = 1.71 BD3/2
    • D. Q = 1/71 BD2/3
    • E. none of these.
      • Discuss

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