Quiznetik

Irrigation Engineering | Set 4

1. Lacey assumed a trapezoidal cross-section of a regime channel

Correct : B. No

2. Lining of a canal

Correct : B. decreases

3. The berms when fully formed

Correct : D. all of the above

4. The smooth entry, the regulators are aligned at an angle of

Correct : C. 110?

5. Irrigation is supplementary to rainfall.

Correct : A. Agree

6. Trough stage of river is most suitable location for diversion head works.

Correct : A. Yes

7. A useful soil moisture for plant growth is

Correct : A. capillary water

8. An outlet in which the discharge depends upon the difference in level between the water levels in distributing channel and the water course, is known as

Correct : A. non-modular outlet

9. The river training works are adopted on a river

Correct : D. all of the above

10. The science which deals with the measurement of water is called hydrometry.

Correct : A. True

11. The gap or margin of height, between full supply level (F.S.L.) and top of the bank is called

Correct : A. free board

12. The optimum depth of kot watering is 19 cm for

Correct : C. rice

13. The width of meandering belt is the

Correct : A. transverse distance between the apex point of one curve and apex point on reverse curve

14. The function of a scouring sluice is

Correct : D. all of the above

15. In case of syphon aqueduct, the H.F.L. of the drain is

Correct : B. much higher above the canal bed

16. A canal head work in rocky stage of a river is not suitable because

Correct : D. all of the above

17. Non-silting, non-scouring velocity is called

Correct : B. critical

18. Sprinklar irrigation is adopted for

Correct : B. uneven

19. In a Sarda type fall, the trapezoidal crest is used for discharges over 14 m3/s.

Correct : A. Correct

20. The flexibility of a sub-proportional outlet is less than one

Correct : A. Yes

21. A part of water which will move out of the soil, if proper drainage is provided, is known as gravitational water.

Correct : A. True

22. In level crossing, the water level of canal is much higher than that of the drainage.

Correct : B. False

23. The length of groyne depends upon the magnitude of river training required.

Correct : A. Right

24. When the quantity of the earth is much in excess of the quantity required for filling, it has to be deposited in the form of spoil banks. The spoil banks are made on

Correct : D. all of these

25. Irrigation

Correct : A. increases

26. Tortuosity of a meandering river is the ratio of

Correct : C. curved length along the river to the direct axial length of the river

27. For irrigation purposes, the p-H value of water should be

Correct : B. between 6 and 8.5

28. The precipitation caused by lifting of warm moisture laden air masses due to topographic barriers, is called

Correct : B. orographic precipitation

29. Which of the following is a type of non-modular outlet?

Correct : A. Submerged pipe outlet

30. Flood frequency denotes the likelyhood of flood being equalled or exceeded.

Correct : A. Yes

31. A degrading river is a scouring river.

Correct : A. Yes

32. The water content at which plants can no-longer extract sufficient water from the soil for its growth, is called

Correct : C. permanent wilting point

33. Lacey gave a relation between

Correct : C. both (a) and (b)

34. According to Khosla's theory, the critical hydraulic gradient for alluvial soils is approximately equal to

Correct : A. 1

35. When the bed level of the canal is higher than the highest flood level (H.F.L.) of the drainage, then the cross drainage work is said to be

Correct : A. aqueduct

36. The floor of the aqueduct is subjected to uplift pressure due to

Correct : C. both (a) and (b)

37. When the levels are such that the F.S.L. of the canal is much above the bed level of the drainage trough, so that the canal runs under syphonic action under the trough, the structure provided is known as

Correct : C. canal syphon

38. A fall, which maintains the depth is a

Correct : D. all of these

39. The soil becomes, practically, infertile if its p-H value is

Correct : C. 11

40. For the pipe outlet to be proportional, the outlet is set at

Correct : A. 0.3 times

41. In a lined canal, the resistance to flow decreases and velocity of flow increases.

Correct : A. Agree

42. According to Lacey, a channel is said to be in regime, if

Correct : D. all of the above

43. Which of the following satement is correct?

Correct : A. In Lacey's silt theory, the derivation of the various formulae depends upon a single factor 'f'.

44. Okhla weir on Yamuna river, in Delhi, is an example of

Correct : B. drystone slope weir

45. Kennedy gave a relation between

Correct : C. critical velocity and the depth of flowing water

46. Check flooding method of irrigation is used for

Correct : C. crops which can stand inundation of water for sometime

47. Lacey assumed that silt is kept in suspension because of the normal components of eddies generated from the

Correct : C. whole perimeter

48. In Bligh's creep theory

Correct : D. all of the above

49. Dicken's formula for high flood discharge is useful for catchments in

Correct : B. Northern India

50. Intensity of irrigation should be increased in order to prevent the area from water logging.

Correct : B. No

51. The irrigation is necessary in an area

Correct : D. all of the above

52. The infertility of the soil in water-logged areas is due to

Correct : D. all of these

53. A canal outlet should

Correct : D. all of the above

54. The moisture content of the soil, after free drainage has removed most of the gravity water, is known as

Correct : A. field capacity

55. A solid construction put across the river to raise its water level and divert the water into the canal, is known as

Correct : B. weir

56. The most economical section of a lined canal is

Correct : E. both (b) and (c)

57. A side slope canal, cross-drainage works are completely eliminated.

Correct : A. Agree

58. The hydrology helps in

Correct : D. all of these

59. A weir is generally aligned at right angle to the direction of the main river flow because

Correct : D. all of these

60. A deflecting groyne in a river is

Correct : B. perpendicular to bank

61. The method used for training of rivers is

Correct : D. all of these

62. In a barrage, crest level is kept

Correct : A. low with large gates

63. The process of loosing water from the leaves of plants, is termed as

Correct : C. transpiration

64. A graph showing variations of discharge with time, at a particular point of a stream is known as

Correct : C. hydrograph

65. The average duty for sugar-cane in hectares/cumec is

Correct : D. 800

66. When river flows in a plain country, its stage is known as

Correct : C. trough

67. In a syphon, the underside of the trough carrying drainage water is

Correct : B. higher than

68. A land is said to be water-logged when

Correct : A. the air circulation is stopped in the root zone due to the rise in water table

69. The setting for a sub-proportional outlet is

Correct : B. less

70. The maximum rainfall during a short period measured in mm / hour is called mean annual rainfall.

Correct : B. Disagree

71. The time (in days) that crop takes from the instant of its sowing to that of its harvest, is known as

Correct : B. crop

72. The perimeter discharge (P-Q) relation is given by the equation

Correct : C. P = 4.75 Q1/2

73. Available moisture may be defined as the

Correct : B. difference in water content of the soil between field capacity and permanent wilting

74. Which of the following statement is correct?

Correct : C. The capillary water is utilised by the plants.

75. The fall of moisture from the atmosphere to the earth surface in any form, is called

Correct : C. precipitation

76. The graphical representation of average rainfall and rainfall excess (i.e. rainfall minus infiltration) rates over specified areas during successive unit time intervals during a storm is known as

Correct : C. hyetograph

77. The maximum depth in soil strata, in which the crop spreads its root system, and derives water from the soil, is called

Correct : B. root zone depth

78. In a canal section, which is in partial filling and partial cutting

Correct : E. both (a) and (b)

79. The free board in a channel is governed by the

Correct : D. all of these

80. According to Khosla's theory, the exit gradient in the absence of a downstream cut-off is

Correct : C. infinity

81. Which of the following statement is wrong?

Correct : D. none of the above

82. Water logging takes place due to

Correct : A. rise

83. Outlet discharge for a particular crop is given by

Correct : A. Area / Outlet factor

84. Which of the following statements is wrong?

Correct : D. Water logging makes the land more productive.

85. A groyne

Correct : D. all of the above

86. An aggrading river is a

Correct : B. silting

87. The consumptive use of water of a crop

Correct : D. all of the above

88. A deflecting groyne has a much

Correct : B. shorter

89. Which of the following method is useful for obtaining values of flood discharges for a high recurrence interval?

Correct : C. Gumbel's method

90. The first watering, when the crop has grown a few centimetres, is called paleo.

Correct : B. Disagree

91. A river training work is generally required when the river is

Correct : C. meandering type

92. The narrow strip of land left at the ground level between the inner toe of the bank and top edge of the cutting, is known as

Correct : D. berm

93. Run-off is measured in

Correct : A. m3/s

94. Irrigation is said to be a science of survival.

Correct : A. Correct

95. According to Lacey

Correct : D. all of the above

96. The height of dowel above the road level should not be more than

Correct : C. 30 cm