Irrigation Engineering Online Test – Paper 3

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

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

3. *Which is the best hydraulic section of the following open channel cross-section?

4. Optimum depth of kor watering for wheat in the plains or terai is

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

6. Critical flow is

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

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

9. *The most efficient section of a channel is

10. Silt is a

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

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

13. The proportion of silt per unit volume by weight in water is called

14. The fall, which can be used as a meter fall, is

15. River resulting from a deficit of sediments in flowing water is

16. Aggrading river is characterized by

17. A contour canal

18. *A wall built across a small channel and provided with a regulating arrangement to head up water on the upstream side is known as

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

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

21. The uplift pressure on the face of a drainage gallery in a dam is equal to

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

23. A rectangular channel is said to be wide if

24. *Rugosity coefficient for a silt clay

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

26. In a gravity dam, the main overturning force is

27. A canal, designed to irrigate throughout the year, is

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

29. The numerical value of the base period is

30. 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

31. A wall built along the bank of a river, parallel to the direction of flow for directing fast flow from a sluice or spillway, to prevent eroding banks of a river or canal, is called

32. *Hydrograph is the graphical representation of

33. A canal, constructed by the side of and generally parallel to the parent canal with a different bed slope is called

34. The type of fall suitable for any discharge is

35. In an earthen dam, seepage through the foundation is controlled by providing

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

37. The fall using a parabolic glacis for energy dissipation is

38. Crop water is proportional to

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

40. *Available moisture may be defined as the

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

42. The water face of the guide banks is protected by

43. *Lime concrete lining is used

44. *The amount of water required to fill up the pore spaces in soil particles by replacing all air held in pore spaces is known as

45. *The difference in level between the top of a bank and full supply level in a canal is known as

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

47. Lands or climate that lack sufficient water for agriculture without artificial irrigation are called

48. *In irrigation canals, the reasons for water losses are

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

50. *A protective and training bank, constructed at the site of a bridge or weir to guide the river through the waterway provided in the structure, is called