# Civil Engineering - Irrigation

### Exercise :: Irrigation - Section 1

26.

Pick up the correct statement from the following

 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.

Explanation:

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27.

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

 A. Bligh's theory B. Electrical analogy method C. The relaxation method D. Khosla's method of independent variables.

Explanation:

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28.

 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.

Explanation:

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29.

The sinuosity of a meander is the ratio of

 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.

Explanation:

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30.

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

 A. 6 B. 8 C. 9 D. 10 E. 11