Irrigation Engineering Online Test – Paper 3

1. The supply passing down the parent channel is controlled by

2. *Surface float method is used to measure

3. A canal which is aligned at right angles to the contour is called

4. Waterlogging of fields can be reduced by

5. *If the irrigation canal and drain are at the same level, the cross drainage work is achieved by providing

6. *Attracting type spurs

7. A canal normally used for the diversion of floodwaters of a river is

8. The duty is largest

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

10. A sudden fall of the level of the ground along the alignment of the canal joined by an inclined bed is called a

11. *Site of the head works is good when

12. Vertical acceleration due to an earthquake results in

13. *Weed growth in a canal leads to

14. The flow of water after spilling over the spillway respectively is

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

16. If there are two canals taking off from each bank of a river, then there will be

17. The maximum quantity of water that can be supplied from the reservoir with full guarantee during the worst dry period is known as

18. Horizontal acceleration due to an earthquake results in

19. *The total depth of water required by a crop during the entire period the crop is in the field is known as

20. Whenever an embankment has to be built on unreliable soil, provision is made for

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

22. The degree of sinuosity is the ratio between

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

24. The floor of an aqueduct is subjected to uplift pressure due to

25. *In a syphon aqueduct, the maximum uplift pressure on the floor occurs when

26. *A divide wall is provided to

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

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

29. For the upstream face of an earthen dam, the most adverse condition for the stability of slope is

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

31. As per Lacey's theory, the silt factor is

32. Bed bars provided in a canal are made of

33. The most suitable section of a lined canal is

34. *According to Manning's formula, the velocity is inversely proportional to

35. *Fall is provided in the canal of

36. *After entering the canal, sediments are removed by the

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

38. *A diversion head work is constructed to

39. According to Khosla's theory, the exit gradient in the absence of a downstream cutoff is

40. The uplift pressure acting on a dam is controlled by

41. *The main function of a diversion head works of a canal from a river is to

42. The top of the capillary zone

43. *The hydraulic jump is known as

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

45. *The process by which unculturable soil made culturable is known as

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

47. The water stored in the reservoir below the minimum pool level is called

48. With respect to inlet and outlet, which one is correct?

49. The ratio of the rate of change of the discharge of an outlet to the rate of change of the discharge of the distributing channel is called

50. *Irrigation distributor canals are generally aligned along