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Civil Engineering :: Irrigation Engineering

  1. The uplift pressure on a dam can be controlled by
    i) constructing cutoff under upstream face
    ii) constructing drainage channels bet-ween the dam and its foundation
    iii) by pressure grouting in foundation
    The corret answer is

  2. A.

     only (i)

    B.

     both (i) and (ii)

    C.

     both (i) and (iii)

    D.

     (i), (ii) and (iii)


  3. If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be

  4. A.

     1 + (0.9)010

    B.

     1 – (0.9)°l0

    C.

     1/(1-0.9°10)

    D.

     1/(1+ 0.9010)


  5. The width of a meander belt is the transverse distance between

  6. A.

     Apex point of one curve and apex point of the reserve curve

    B.

     Apex point and the crossing

    C.

     Two banks of meandering river

    D.

     None of these


  7. Pick up the correct statement from the following:

  8. 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 utilized by plants

    D.

     All the above


  9. The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is

  10. A.

     less than 1

    B.

     equal to 1

    C.

     greater than 1

    D.

     equal to zero


  11. The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be

  12. A.

     637 hectares/m3/sec

    B.

     837 hectares/m3/sec

    C.

     972 hectares/m3/sec

    D.

     1172 hectares/m3/sec


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

  14. A.

     To remove silt

    B.

     To control floods

    C.

     To store water

    D.

     To raise water level


  15. The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called

  16. A.

     effective rainfall

    B.

     consumptive use

    C.

     consumptive irrigation requirement

    D.

     net irrigation requirement


  17. For wave action in dams, the maximum height of freeboard is generally taken to be equal to (where hw is height of wave.)

  18. A.

     0.5 hw

    B.

     0.75 hw

    C.

     1.25 hw

    D.

     1.50 hw


  19. The intensity of irrigation means

  20. 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