Irrigation engineering

41. Pick up the correct statement from the following A. Escapes are essential safety valves in a canal system B. The escapes must lead the surplus water to natural drainages C. The escapes are aligned to take advantage of contours of lower values D. All the above

Escapes are essential safety valves in a canal system
The escapes must lead the surplus water to natural drainages
The escapes are aligned to take advantage of contours of lower values
All the above

Detailed SolutionPick up the correct statement from the following A. Escapes are essential safety valves in a canal system B. The escapes must lead the surplus water to natural drainages C. The escapes are aligned to take advantage of contours of lower values D. All the above

43. If average particle size of the silt in millimeters is m, the Lacey’s silt factor f is proportional to A. m3 B. $${{\text{m}}^{\frac{1}{2}}}$$ C. $${{\text{m}}^{\frac{1}{3}}}$$ D. $${{\text{m}}^{\frac{2}{3}}}$$

m3
$${{ ext{m}}^{rac{1}{2}}}$$
$${{ ext{m}}^{rac{1}{3}}}$$
$${{ ext{m}}^{rac{2}{3}}}$$

Detailed SolutionIf average particle size of the silt in millimeters is m, the Lacey’s silt factor f is proportional to A. m3 B. $${{\text{m}}^{\frac{1}{2}}}$$ C. $${{\text{m}}^{\frac{1}{3}}}$$ D. $${{\text{m}}^{\frac{2}{3}}}$$

44. If V0 is the critical velocity of a channel, its silt transporting power, according to Kennedy is proportional to A. $${\text{V}}_0^{\frac{1}{2}}$$ B. $${\text{V}}_0^{\frac{3}{2}}$$ C. $${\text{V}}_0^{\frac{5}{2}}$$ D. $${\text{V}}_0^{\frac{7}{2}}$$

$${ ext{V}}_0^{rac{1}{2}}$$
$${ ext{V}}_0^{rac{3}{2}}$$
$${ ext{V}}_0^{rac{5}{2}}$$
$${ ext{V}}_0^{rac{7}{2}}$$

Detailed SolutionIf V0 is the critical velocity of a channel, its silt transporting power, according to Kennedy is proportional to A. $${\text{V}}_0^{\frac{1}{2}}$$ B. $${\text{V}}_0^{\frac{3}{2}}$$ C. $${\text{V}}_0^{\frac{5}{2}}$$ D. $${\text{V}}_0^{\frac{7}{2}}$$

47. The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after A. 50 years B. 150 years C. 200 years D. 250 years

50 years
150 years
200 years
250 years

Detailed SolutionThe total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after A. 50 years B. 150 years C. 200 years D. 250 years

48. While deciding the alignment of a proposed canal taking off from a river at B, three alignments of approximately equal lengths are available. These cross a drainages at C1, C2 and C3 where drainage bed levels C1 > C2 > C3, you will provide at site C3 A. An aqueduct B. A syphon aqueduct C. A super passage D. A syphon

An aqueduct
A syphon aqueduct
A super passage
A syphon

Detailed SolutionWhile deciding the alignment of a proposed canal taking off from a river at B, three alignments of approximately equal lengths are available. These cross a drainages at C1, C2 and C3 where drainage bed levels C1 > C2 > C3, you will provide at site C3 A. An aqueduct B. A syphon aqueduct C. A super passage D. A syphon

49. Pick up the correct sequence of the part of a canal system from the following A. Head work-distributary-branch canal-minor B. Head works-main canal-branch canal-distributary-minor C. Head works-main canal-branch canal-minor-distributary D. Heads works-branch canal-main canal distributary, minor

Head work-distributary-branch canal-minor
Head works-main canal-branch canal-distributary-minor
Head works-main canal-branch canal-minor-distributary
Heads works-branch canal-main canal distributary, minor

Detailed SolutionPick up the correct sequence of the part of a canal system from the following A. Head work-distributary-branch canal-minor B. Head works-main canal-branch canal-distributary-minor C. Head works-main canal-branch canal-minor-distributary D. Heads works-branch canal-main canal distributary, minor

50. The velocity of drainage water in the barrels of a syphon-aqueduct, is normally limited to A. 1 to 2 m per second B. 2 to 3 m per second C. 3 to 4 m per second D. 4 to 5 m per second

1 to 2 m per second
2 to 3 m per second
3 to 4 m per second
4 to 5 m per second

Detailed SolutionThe velocity of drainage water in the barrels of a syphon-aqueduct, is normally limited to A. 1 to 2 m per second B. 2 to 3 m per second C. 3 to 4 m per second D. 4 to 5 m per second

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