Irrigation Engineering Online Test – Paper 3

1. An artesian aquifer is one where

2. The structures constructed transverse to the river flow, which extend from bank to the river, are called

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

4. Gibb's module is a type of

5. In irrigation canals, drops are needed if

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

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

8. The necessity of irrigation is required due to

9. *A divide wall is provided to

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

11. A fall, which maintains its depth, is

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

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

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

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

16. Pitot tube is used to measure

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

18. *To avoid an interruption in the field of a siphon, the air vessel is provided

19. *Groynes are generally provided

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

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

22. The types of reservoirs in which water control devices are not provided are known as:

23. *Drop structures in the canal are provided for

24. Cross walls provided across the stream, built under the floor of a hydraulic structure at the upstream and downstream ends of the pavement to avoid scour and protect floors, abutments etc., and which is carried up to another, is called

25. The main advantage of lining an irrigation channel is

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

27. Weirs designed and constructed on Bligh's theory failed due to

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

29. *The meandering river is always

30. The water-bearing stratum that creates a groundwater reservoir and feeds wells and springs is called

31. The upstream face of an earthen dam is

32. When the reservoir is full, the maximum compressive force in a gravity dam is produced

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

34. In a non-gravity weir, the uplift pressure is resisted by

35. A spoil bank is formed when

36. If the demand line drawn from a ridge in a flow-mass curve does not intersect the curve again, it shows

37. The disadvantage of water logging of fields is

38. The width of a "Dowels" is generally kept between 32 to 60 cm, and the height above the road level should be more than

39. 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

40. The main function of a distributory head regulator is

41. *A groyne

42. Trap efficiency of a reservoir is a function of

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

44. SHAFT spillway is the same as

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

46. *The measure to remove waterlogging of land is

47. *Marginal bund/leeve is an earthen dam constructed roughly

48. The top of the capillary zone

49. 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

50. In a gravity dam, the total force due to wave pressure acts at a height of (Where hw is the height of wave)