Irrigation Engineering Online Test – Paper 3

1. An impervious wall inside an earthen dam to reduce seepage is known as

2. *Groynes are generally provided

3. For the maximum velocity occurring in a canal, the hydraulic mean depth is

4. Bed bars provided in a canal are made of

5. *Bed bars in a canal are provided

6. Percolation loss is less in the case of

7. A counter berm is

8. If the RLs of canal bed level and high flood level of drainage are 210.0 m and 212.0 m respectively, then the cross drainage work will be

9. The crop that improves the nitrogen content of the soil is

10. The methods used for drilling a tube well in compacted rock materials is

11. The main function of a distributory head regulator is

12. The canal head regulator is provided at the head of the offtaking canal to

13. Water found on the surface of the soil, which is not capable of movement either by gravity or capillary and can only be driven off by heat, is called

14. The volume of water stored between normal pool level and the maximum pool level is known as

15. The bed of a canal is lowered in the case of

16. The most suitable section of a lined canal is

17. *Which of the following has the maximum water application efficiency?

18. *When the canal runs below the drain, the cross drainage work provided is called

19. As compared to the crest of the normal portion of the weir, the crest of the undersluice portion of the weir is kept at

20. According to Lacey's regime theory, a channel is said to be in its regime when it satisfies the condition

21. The overflow of a spillway in the shape of a double or s-curve, which is convex at the top and concave at the bottom, is called

22. SHAFT spillway is the same as

23. Canals taken off from ice-fed perennial rivers are known as

24. The discharge capacity of the undersluice is

25. *Silt-carrying capacity of water in a canal depends on

26. *The structure provided where natural drainage and canal meet at the same level is

27. For irrigation purposes, the pH value of water should be

28. For an earthen dam, least suited spillway is:

29. On rolling land, the method of applying water is

30. A spoil bank is formed when

31. Salt present in water, harmful for cultivation purposes, is

32. *Depth of canal cross-section such that the quantity of excavation is equal to the earthwork required for banks is known as

33. When the discharge of a well decreases by the design amount, then this type of well is called

34. On a suitable foundation, the earthen dam can be constructed up to a height of

35. In a syphon spillway, the effective head is measured

36. *Surface float method is used to measure

37. A groyne with a curved head is known as

38. If the value of sodium-absorption ratio lies between 10 to 18, it is called

39. A cross regulator is provided on the main canal at the

40. *Irrigation distributor canals are generally aligned along

41. The thickness of concrete lining, for discharge up to 200 cumecs, varies from

42. The water utilized by plants is available in soils mainly in the form of

43. According to Lacey's theory, the depth of scour in the case of a right-angle bend is

44. *A river training work is generally required when the river is

45. *A divide wall is provided to

46. *The maximum failure of earthen dams occurs due to

47. *Main purpose of mean water training for rivers is

48. Boron concentration in water for irrigation should be limited to

49. In waterlogged lands

50. The degree of sinuosity is the ratio between