Irrigation Engineering Online Test – Paper 3

1. If the RLs of canal bed level and HFL of drainage are 202.0 m and 200.0 m respectively, then the cross drainage work will be

2. *Weir method is used to measure

3. An excavation in the base of a dam or other structures filled with relatively impervious material to reduce percolation is called

4. The proportion of silt, water, and the size of silt particles carried depend upon

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

6. The method of irrigation, in which land surrounded by natural or artificial banks is flooded, is known as

7. The effective precipitation for a crop is the water which is equal to

8. *Pick up the correct sequence of the parts of a canal system

9. The "outlet discharge factor" is the duty at the head of

10. Hydrodynamic pressure due to an earthquake acts at a height of

11. *Due to topography, if the space is not available, the most suitable spillway is

12. *The phenomenon of salts coming up in solution and forming a layer of crust on the surface after the evaporation of water is known as

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

14. *Bell bunds are

15. A weir constructed to divert part or all of the water from the stream into a different course is called

16. *The discharge through a channel is maximum when

17. *The maximum discharge through a circular channel takes place when the depth of flow is equal to

18. Disposal of extra excavated earth of canals is utilized to provide a spoil bank on

19. The type of irrigation during a low quantity of water

20. Retrogression of the bed level of a river downstream a weir or barrage occurs due to

21. The kor depth for rice is 19 cm, and the kor period is 14 days. The outlet factor for this will be

22. The silting in a channel occurs due to

23. The minimum size of the stone that will remain at rest in a channel of longitudinal slope, S, and hydraulic mean depth, R, is given by

24. *Surface float method is used for the velocity measurement while the current meter is used for the measurement of

25. The most suitable section of a lined canal is

26. Waterlogging may result from

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

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

29. The angle between the head regulator and the water, for smooth entry of water into a canal, is generally kept at

30. *Economic height of a dam is

31. A groyne with a curved head is known as

32. Necessity of cross-drainage works arises when

33. *The maximum velocity in a circular channel of diameter D occurs when the depth of flow is

34. The formula V=0.55 mD0.64 is given by

35. The group of canals which avoid cross drainage work

36. The fall, with the crest usually at or near the bed level, without a glacis, is called

37. The disadvantage of water logging of fields is

38. A weir, which has a tail water level higher than the weir crest, by which the discharge is affected, is called

39. *When a canal is carried over a natural drainage, the structure provided is known as

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

41. For economical design of a gravity dam, the shear friction factor should be

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

43. *The discharge through a trapezoidal channel is maximum when

44. A fall, which maintains its depth, is

45. *A device provided near weirs or dams to facilitate the migration of fish upstream or downstream around the weirs is called

46. In a chute spillway, the flow is generally:

47. Roughness of the bed and sides of a channel can be reduced by

48. In rice, the depth of the root zone is generally,

49. The name of the structure that destroys the energy is called

50. The portion of the reservoir normally not utilized is: