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Civil Engineering :: Irrigation

  1. A deficit of sediments in flowing water may cause a river

  2. A.

    meandering type

    B.

    aggrading type

    C.

    degrading type

    D.

    sub-critical type.

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  3. Pick up the correct statement from the following:

  4. A.
    The full supply level of a canal should be above ground level
    B.

    According to Lacey, regime conditions require a particular slope for a given discharge and silt factor

    C.

    In case the ground slope is less than the required bed slope, the silt factor must be reduced by permitting the entry of coarse sil

    D.
    All the above.

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  5. If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hactare/cumec, the relationship which holds good, is

  6. A.

    D =Δ \(\frac { 8.64D } { B} \)

    B.

    B =Δ\(\frac { 8.64​​D} { B} \)

    C.

    D =\(\frac { 8.64​​Δ} { B} \)

    D.

    Δ=\(\frac { 8.64​​B} { D}\)

    E.

    none of these.


  7. Meandering of a river generally occurs, in

  8. A.

    rocky stage

    B.

    delta stage

    C.

    boulder stage

    D.

    trough stage.


  9. The consumptive use of water for a crop

  10. A.

    is measured as the volume of water per unit area

    B.

    is measured as depth of water on irrigated area

    C.

    may be supplied partly by precipitation and partly by irrigation

    D.

    all the above.

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  11. The velocity of drainage water in the barrels of a syphon-aqueduct, is normally limited to

  12. A.

    1 to 2 m per second

    B.

    2 to 3 m per second

    C.
    3 to 4 m per second
    D.

    4 to 5 m per second.

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  13. A fall in a canal bed is generally provided, if

  14. 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.

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  15. According to Khosla, the exist gradient of surface flow

  16. 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.

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  17. Pick up the correct statement from the following:

  18. A.
    Gravity water is harmful to crops
    B.
    Hygroscopic water remains attached to soil molecules by chemical bond
    C.
    Capillary moisture held in the soil pores against gravity by surface tension, is utilised by plants
    D.
    All the above.

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  19. 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

  20. A.

    10 cm

    B.
    15 cm
    C.

    20 cm

    D.

    25 cm

    E.

    30 cm

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