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Civil Engineering :: Irrigation

  1. If A is the area of the surface, x is the depth of its C.G. from the surface of the water and ω is the density of water, then

  2. A.

    total pressure on the surface is equal to ω x

    B.

    depth of the point at which total pressure acts is equal to its moment of inertia divided by A x

    C.

    depth of the centre of pressure is 2/3H vertically below the surface

    D.

    all the above.

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  3. V and R are the regime mean velocity and hydraulic mean depth respectively in metres. Lacey's silt factor f is

  4. A.

    \( \frac { 2V^2 } { \sqrt{ 3} R} \)

    B.

    \( \frac { 3V^2 } { 4R} \)

    C.

    \( \frac { 5V^2 } { 2R} \)

    D.

    \( \frac { 2V^2 } { 5 R} \)


  5. Pick up the correct statement from the following

  6. A.

    Escapes are essential safety valves in a canal system

    B.

    The capacity of escapes should not be less than the capacity of the canal at its location

    C.
    The escapes must lead the surplus water to natural drainages
    D.

    The escapes are aligned to take advantage of contours of lower values

    E.

    All the above.

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  7. According to Kennedy, the critical velocity (V0) in metres 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).


  8. According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is

  9. A.

    1.25 D

    B.

    1.50 D

    C.

    1.75 D

    D.

    2.00 D

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  10. The  width of a dowla is generally kept between 30 to 60 cm and its height above the road level  should invariably be moe than

  11. A.

    10 cm

    B.

    20 cm

    C.

    30 cm

    D.

    40 cm

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  12. The field capacity of a soil depends upon

  13. A.

    capillary tension in soil

    B.

    porosity of soil

    C.

    both (a) and (b)

    D.

    neither (a) nor (b).

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  14. Finally formed berms in canals are provided for

  15. A.

    protection of banks erosion by the waves

    B.

    control of seepage losses

    C.

    strengthening of banks

    D.

    all the above.

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  16. An outlet is said to be proportional if its flexibility, is

  17. A.

    zero

    B.

    less than one

    C.
    more than one
    D.
    one

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  18. The ratio of the discharge over a trapezoidal crest to a rectangular crest of Sarda falls of identical parameters, is

  19. A.

    1.084

    B.

    1.074

    C.

    1.064

    D.

    1.054

    E.

    2.053

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