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Civil Engineering :: Irrigation Engineering

  1. Trap efficiency of a reservoir is a function of

  2. A.

     capacity/inflow ratio

    B.

     capacity/outflow ratio

    C.

     outflow/inflow ratio

    D.

     none of the above

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  3. Seepage through embankments in an earthen dam is controlled by

  4. A.

     drainage filters

    B.

     relief wells

    C.

     drain trenches

    D.

     provision of downstream berms

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  5. A river is said to be of

  6. A.

     Aggrading type if it builds up its bed to a certain slope

    B.

     Degrading type if it cuts its bed to a certain slope

    C.

     Meandering type if it flows in sinuous curve

    D.

     All the above

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  7. An artesian aquifer is the one where

  8. A.

     water surface under the ground is at atmospheric pressure

    B.

     water is under pressure between two impervious strata

    C.

     water table serves as upper surface of zone of saturation

    D.

     none of the above

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  9. For a unique design of a channel by Kennedy's theory

  10. A.

     Its breadth must only be known

    B.

     Its depth must only be known

    C.

     Its breadth and depth ratio must only be known

    D.

     All the above

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  11. The scour depth D of a river during flood, may be calculated from the Lacey's equation

  12. A.

     D = 0.47 (Q/f)

    B.

     D = 0.47 (Q/f)1/2

    C.

     D = 0.47 (Q/f)1/3

    D.

     D = 0.47 (Q/f)2/3

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  13. Unit of runoff in M.K.S. system is

  14. A.

     cubic metre/sec

    B.

     metre/sec

    C.

     cubic metre

    D.

     square metre

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  15. Under the same conditions, which of the following shapes of water surface will give the highest rate of evaporation ?

  16. A.

     flat water surface

    B.

     convex water surface

    C.

     concave water surface

    D.

     independent of shape of water surface

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  17. The main cause of meandering is

  18. A.

     presence of an excessive bed slope in the river

    B.

     degradation

    C.

     the extra turbulence generated by the excess of river sediment during floods

    D.

     none of the above

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  19. According to Kennedy, the critical velocity (V₀) in meters in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).

  20. A.

     V₀ = 0.84 mD0.64

    B.

     V₀ = 0.55 mD0.64

    C.

     V₀ = 0.84 mD0.54

    D.

     V₀ = 0.55 mD0.54

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