Civil Engineering - Irrigation

Exercise :: Irrigation - Section 3

41. 

According to Lacey, in regime conditions

A. silt is kept in suspension by vertical components of eddies
B. entire cross-section of the channel is generated at all points by the forces normal to the wetted perimeter
C. both (a) and (b)
D. neither (a) nor (b).

Answer: Option C

Explanation:

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42. 

Process of meandering is due to

A. sediment load of streams
B. discharge and hydraulic properties of streams
C. relative erodibility of the bed and banks
D. all the above.

Answer: Option D

Explanation:

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43. 

If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor down stream of the crestwall, is given by the equation

A.
B.
C.
D.

Answer: Option C

Explanation:

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44. 

For cereal crops the most commonly adopted method of irrigation, is

A. free flowing method
B. check method
C. furrow method
D. sprinkling method.

Answer: Option B

Explanation:

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45. 

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.

Answer: Option A

Explanation:

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