Irrigation Engineering

71. Irrigation canals are generally aligned along

1. Ridge line
2. Contour line
3. Valley line
4. Straight line

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72. Lacey's equation for calculating flood discharge in rivers, is

1. V = 10.8 R^1/2 S^1/2
2. V = 10.8 R^2/3 S^1/2
3. V = 10.8 R^2/3 S^1/3
4. V = 10.8 R^1/3 S^1/2

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73. Lacy's regime condition is obtained if

1. Silt grade in the channel is variable
2. Discharge in the channel is variable
3. Silt charge in the channel is variable
4. Channel flows in unlimited, incoherent alluvium of the same character as that transported material

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74. Lane's weighted creep theory assumes

1. Equal weightage to horizontal and vertical creeps
2. Double weightage to horizontal creep and one weightage to vertical creep
3. Triple weightage to horizontal creep and one weightage to vertical creep
4. Triple weightage to vertical creep and one weightage to horizontal creep

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75. Meandering of a river generally occurs, in

1. Rocky stage
2. Delta stage
3. Boulder stage
4. Trough stage

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76. Pick up the correct sequence of the part of a canal system from the following

1. Head work-distributary-branch canal-minor
2. Head works-main canal-branch canal-distributary-minor
3. Head works-main canal-branch canal-minor-distributary
4. Heads works-branch canal-main canal distributary, minor

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77. Pick up the correct statement from the following

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

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78. Pick up the correct statement from the following:

1. Gravity water is harmful to crops
2. Hygroscopic water remains attached to soil molecules by chemical bond
3. Capillary moisture held in the soil pores against gravity by surface tension, is utilised by plants
4. All the above

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79. Pick up the incorrect statement from the following

1. Side walls of a venturi head flume are splayed out from the end of the throat at 1 : 10 for a length of 4.5 m
2. Length of side walls should be such that the width of the flume is made equal to 2/3rd the bed width of the distributary
3. Once the width of the flume becomes 2/3rd of the width of the distributary, the splayed walls are increased to 1 in 3 to get full bed width
4. None of these

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80. Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less

1. Populated area
2. Alkaline area
3. Forest area
4. Fallow land

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