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Civil Engineering :: Irrigation

  1. The main function of a diversion head works of a canal from a river, is

  2. A.

    to remove silt

    B.

    to control floods

    C.

    to store water

    D.

    to raise water level

    E.

    all the above.


  3. Side slopes generally kept for canals in loam soil, are :

  4. A.

    1 : 1 in cutting and  1 \( \frac { 1 } { 2 } \) : 1 in filling

    B.

    1\( \frac { 1 } { 2 } \): 1 in cutting and 2 : 1 in filling : 1 in cutting and 2 : 1 in filling

    C.

     Neither (a) nor (b)

    D.

    Both (a) and (b)


  5. When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called

  6. A.

    syphon

    B.

    aqueduct

    C.

    super passage

    D.

    syphon-aqueduct.


  7. For the conditions enumerated to provide a crossing at C1 You will probably provide

  8. A.
    an aqueduct
    B.
    a super-passage
    C.

    a syphon aqueduct

    D.

    none of these.


  9. For the conditions enumerated to provide a crossing at C1 You will probably provide

  10. A.
    an aqueduct
    B.
    a super-passage
    C.

    a syphon aqueduct

    D.

    none of these.


  11. If the straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the perimeter of the canal is

  12. A.

    R(θ + tan θ)

    B.

    2R(θ + tan θ)

    C.
    R(θ + cos θ)
    D.

    2R(θ + cos θ)

    E.

    none of these.


  13. The crest level of a canal diversion head work, depends upon

  14. A.

    F.S.L. of the canal

    B.

    discharge perimeters

    C.

    pond level

    D.

    all the above

    E.

    none these.


  15. The depth of rice root zone, is

  16. A.

    50 cm

    B.
      60 cm
    C.

    70 cm

    D.

    80 cm

    E.

    90 cm


  17. The intensity of irrigation means

  18. A.

    percentage of culturable commanded area to be irrigated annually

    B.
    percentage of gross commanded area to be irrigated annually
    C.
    percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
    D.
    total depth of water supplied by the number of waterings.

  19. The saturation line is the line up to which banks get saturated after the canal runs for some time. The saturation gradient in ordinary loam soil, is generally

  20. A.

    2 : 1

    B.

    3 : 1

    C.

    4 : 1

    D.

    5 : 1

    E.

    6 : 1