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Civil Engineering :: Irrigation

  1. For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is

  2. A.

    zero

    B.

    0.25

    C.

    0.50

    D.

    0.75

    E.

    1.00


  3. Pick up the correct statement from the following

  4. A.

    Approach of the water line in a flumed channel section should not be steeper than 22 \( \frac { 1 } { 2 }^0\)

    B.

    Departure of the water line from a flumed channel section should not be steeper than 30°

    C.

    Approach of the water line should not be steeper than 30° and departure line not steeper than  22\( \frac { 1 } { 2 }^0\) in a flumed channel section

    D.

    Approach and departure of the water line in a flumed channel section, should not be steeper than 22 \( \frac { 1 } { 2 }^0\)


  5. Groynes are generally built

  6. A.

    perpendicular to the bank

    B.

    inclined up stream up to 30°

    C.

    inclined down stream upto 30°

    D.

    all the above.


  7. The top of the capillary zone

  8. A.

    lies below the water table at every point

    B.

    lies above the water table at every point

    C.

    coincides the water table at every point

    D.

    none of these.


  9. Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less

  10. A.

    populated area

    B.

    alkaline area

    C.

    forest area

    D.

    fallow land.

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  11. Pick up the correct statement from the following

  12. A.

    In a level crossing, a crest with its top at the canal F.S.L. is provided across the drainage at its up-stream junction with canal

    B.

    In a level crossing a regulator is provided across the drainage at its down-stream

    C.

    in a level crossing, a cross regulator is provided on the canal below the crossing

    D.
    All the above.

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  13. For the design of major hydraulic structures on the canals, the method generally preferred to, is based on

  14. A.

    Bligh's theory

    B.

    Electrical analogy method

    C.

    The relaxation method

    D.

    Khosla's method of independent variables.

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  15. For designing the venturi head,

  16. A.

    width of the throat should not be less than one-third of the bed width of main canal

    B.
    width of the throat should not be less than the width obtained from the formula B = Q / 1.2d3/2, where d is the difference in levels of F.S.L. and sill
    C.

    minimum throat width should not be less than 60 cm

    D.

    length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal

    E.

    all the above

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  17. The sinuosity of a meander is the ratio of

  18. A.

    meander length and the width of meander

    B.
    meander length and half width of the river
    C.

    curved length and the straight distance

    D.

    none of these.

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  19.  

    The top soil of a water logged field becomes more alkaline and infertile if its pH value is

  20. A.

    6

    B.

    8

    C.

    9

    D.

    10

    E.

    11

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