Pick up the correct statement from the following Escapes are essential safety va

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Question
Pick up the correct statement from the following
Options
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.

Correct Answer

All the above.

Irrigation problems

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1. A current meter measures the velocity of flow, if it is held
Options
A. on the surface of water
B. at the bottom of channel
C. at any point within the cross-section
D. none of these.

2. In a syphon aqueduct
Options
A. drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough
B. drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough
C. canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough
D. canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough.

3. The most suitable section of a lined canal, is
Options
A. triangular section with circular bottom for small canals
B. trapezoidal section with rounded corners for large canals
C. rectangular section with rounded corners for large canals
D. both (a) and (b)
E. both (a) and (c)

4. The ratio of the rate of change of discharge of an outlet to the rate of change in level of water surface in a distributary at its normal depth, is known as
Options
A. efficiency
B. sensitivity
C. flexibility
D. modular limit.

6. 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).
Options
A.
B.
C.
D.

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

8. Lane's weighted creep theory assumes
Options
A. equal weightage to horizontal and vertical creeps
B. double weightage to horizontal creep and one weightage to vertical creep
C. triple weightage to horizontal creep and one weightage to vertical creep
D. triple weightage to vertical creep and one weightage to horizontal creep
E. double weightage to vertical creep and one weightage to horizontal creep.

9. If D_c is the critical depth, D is the depth of water down stream and H_L is the total head loss at the cistern of a vertical fall, the depth x of the cistern below the bed level down stream suggested by Blench, is
Options
A.
B.
C.
D.

10. According to Lacey, in regime conditions
Options
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).

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