Irrigation problems
- 1. In a concrete canal the approximate permissible velocity of water should not exceed
Options- A. 0.5 m/sec
- B. 1 m/sec
- C. 1.5 m/sec
- D. 2 m/sec
- E. 2.5 m/sec Discuss
Correct Answer: 2 m/sec
- 2. If the straight sides of a triangular section of a lined canal with circular bottom of radius D, make an angle ? with horizontal, the hydraulic mean depth is
Options- A. D
- B. D/2
- C. D/3
- D. D/4
- E. D/5 Discuss
Correct Answer: D/2
- 3. The ratio of the rate of change of discharge of an outlet and parent channel, is known as
Options- A. efficiency
- B. sensitivity
- C. flexibility
- D. modular limit. Discuss
Correct Answer: flexibility
Explanation:
Flexibility: It provides a criteria for judging the behaviour of modules and semi-modules. It is generally denoted by letter 'F'. It is the ratio of the rate of change of outlet discharge to the rate of change of discharge of the parent channel.
- 4. Finally formed berms in canals are provided for
Options- A. protection of banks erosion by the waves
- B. control of seepage losses
- C. strengthening of banks
- D. all the above. Discuss
Correct Answer: all the above.
- 5. V and R are the regime mean velocity and hydraulic mean depth respectively in metres. Lacey's silt factor f is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 6. According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is
Options- A. 1.25 D
- B. 1.50 D
- C. 1.75 D
- D. 2.00 D Discuss
Correct Answer: 2.00 D
- 7. An outlet is said to be proportional if its flexibility, is
Options- A. zero
- B. less than one
- C. more than one
- D. one Discuss
Correct Answer: one
- 8. For diversion of flood water of rivers, the type of canal constructed, is
Options- A. ridge canal
- B. perennial canal
- C. inundation canal
- D. canal. Discuss
Correct Answer: inundation canal
- 9. Lacey's equation for calculating flood discharge in rivers, is
Options- A. V = 10.8 R1/2 S1/2
- B. V = 10.8 R2/3 S1/2
- C. V = 10.8 R2/3 S1/3
- D. V = 10.8 R1/3 S2/3 Discuss
Correct Answer: V = 10.8 R2/3 S1/3
- 10. Garnett's diagrams are used for graphical solution of design equations of a canal by
Options- A. Lacey's theory
- B. Kennedy's theory
- C. Gibb's theory
- D. Lindlay theory. Discuss
Correct Answer: Kennedy's theory
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