Irrigation Engineering Online Test – Paper 3

1. *In a barrage, the crest level is kept

2. The types of irrigation applicable if there is a scarcity of water with high pressure

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

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

5. *A silt regulator located at the head of a channel is called

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

7. Boulder lining is useful where

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. In an earthen dam, seepage through the embankment is controlled by

10. *The consumptive use of water for a crop

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

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

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

14. The mean velocity, for a channel of given depth, which will just keep the channel free from silting or scouring its bed throughout the year, is called

15. Percolation loss is less in the case of

16. The most suitable location of a canal headwork is

17. According to Kennedy's theory, the silt supporting eddies are generated due to

18. 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

19. A fall in a canal bed is generally provided if

20. *A facing of dry stone pitching or other material laid on a sloping face of earth to maintain the slope in position or to protect it from erosion is called

21. Guide banks for training a river at the site of a bridge or weir are called

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

23. According to Khosla's theory, the exit gradient

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

25. The irrigation with sewage from a town, instead of natural water, is called

26. The relation between duty (D) in hectares/cumec depth of water in meters and base period (B) in days is given by

27. *The discharge in an open channel is inversely proportional to

28. Siltation of a reservoir can be reduced by

29. *The most efficient section of a channel is

30. The consumptive use of water for a crop

31. For standing crops in undulating sandy fields, the best method of irrigation is

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

33. *A groyne

34. *The discharge through a channel is maximum when

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

36. If the electrical conductivity of water is between 750 to 2250 micro mhos/cm at 25°C, then it is classified as

37. The average delta of a rice crop is nearly

38. The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as

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

40. A divide wall is provided

41. An artesian aquifer is one where

42. The method for training of rivers is

43. *The measure to remove waterlogging of land is

44. An aggrading river is

45. A straight glacis type fall with a baffle platform and a baffle wall is called

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

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

48. *Fall is provided in the canal of

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

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