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Irrigation Engineering Practice Test: Irrigation Canals and its Economics
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Avg score: 63% Most missed: “If the free swell index of soil is more than 100, the soil may be expansive.”
Irrigation Canals and its Economics topics include: Canal lining, channel cross-sections, lining advantages, hard surface, earth type or rigid linings, canal lining requirements and expansive soils. Irrigation canals can have positive economic effects, such as: Higher incomes: Investments in irrigation canals can lead to higher incomes for both landowners and landless workers. Higher agricultural productivity: Irrigation canals can increase agricultural productivity in "treatment" villages. Incremental income: Canal irrigation can lead to incremental income from well irrigation. This can... Show more
Irrigation Engineering Practice Test: Irrigation Canals and its Economics
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25 Questions

1. Which of the following is incorrect about the identification of CNS material?
2. Which type of lining is adopted when the channels have become stable and no danger of scouring is expected?
3. What is the safe limiting velocity for cement concrete lining?
4. Removal of silt considerably reduces the annual expenditure required on unlined channels for desilting.
5. Brick lining gives a very satisfactory service.
6. Design a lined canal to carry a discharge of 400 cumecs and slope is 1 in 6000. Take side slopes as 1 : 1 and rugosity constant as 0.012. Assume limiting velocity as 3 m/sec.
7. Design a lined canal carrying a discharge of 20 cumecs. The slope is 1 in 7000. Assume suitable values for side slopes and lining.
8. A flexible membrane impregnated with tar or bitumen is spread over the subgrade in _________________
9. Calculate hydraulic mean depth for concrete-lined channel to carry a discharge of 350 cumecs at a slope of 1 in 5000. The value of manning’s constant for the lining is 0.015. The side slopes of a channel may be taken as 1.5:1. Assume limiting velocity in the channel as 2m/sec.
10. Which of the following statement is wrong?
11. Which of the following is not a cause for the hydrostatic pressure on the lining?
12. Which of the following statement is wrong about the requirement of good lining?
13. What is the minimum value of inspection bank width recommended by Indian Standards if the discharge is more than 30 cumecs?
14. What is the recommended value of CNS thickness to be used for lining over expansive soil with swelling pressure of 200-300 KN/m2?
15. Which type of lining is popular in India?
16. CNS material shall be non-swelling with a minimum of ___________
17. What is the name given to the land unfit for agriculture due to waterlogging?
18. Shotcrete lining can be used highly for smaller jobs.
19. Safety ladders are provided in large irrigation canals to ______________
20. Lining decreases the channel capacity and consequently reduces the required channel section.
21. The larger the thickness of CNS introduced over the expansive soil, the more will be the resulting swelling in soil.
22. Calculate the central depth of a triangular channel section to carry a discharge of 15 cumecs. Consider the available slope as 1 in 9000. Assume the side slopes of the channel be 1.25:1 and manning’s constant is 0.015 for good brick work in lining.
23. What is the range of value of Manning’s coefficient for straight alignment for cast in-situ concrete lining?
24. Lining of canals can bring high areas under command.
25. Drainage relief pockets are provided ___________