Irrigation Engineering Online Test - Paper 3 »Exclusive Quiz

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Total Questions: 50
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1 / 50

1. The degree of sinuosity is the ratio between

a) meander length and meander width

b) meander width and river bed width

c) curved length and straight air length

d) none of the above

2 / 50

2. *Surface float method is used for the velocity measurement while the current meter is used for the measurement of

a) discharge

b) velocity

c) depth

d) amount of silt

3 / 50

3. *The crops require maximum water during

a) first watering when the crop has grown a few centimeters

b) first watering before sowing the crops

c) last watering before harvesting

d) all of the above

4 / 50

4. *The width and length of meander vary approximately with

a) discharge

b) square root of discharge

c) cube root of discharge

d) square of discharge

5 / 50

5. *A groyne

a) widens a river channel to improve its depth

b) deteriorates the river banks

c) silts up the area in the vicinity by creating a slack flow

d) none of the above

6 / 50

6. A repelling groyne is aligned

a) parallel to bank

b) perpendicular to bank

c) pointing up stream

d) pointing down stream

7 / 50

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

a) zero

b) unity

c) infinity

d) none of the above

8 / 50

8. *The measure to remove waterlogging of land is

a) to reduce percolation from canals and watercourses

b) to increase outflow from the groundwater reservoir

c) both (a) and (b)

d) none of the above

9 / 50

9. *The maximum discharge through a circular channel takes place when the depth of flow is equal to

a) 0.95 times the diameter

b) 0.8 times the diameter

c) 0.6 times the diameter

d) 0.5 times the diameter

10 / 50

10. Tortuosity of a meandering river is always

a) more than one

b) equal to one

c) less than one

d) none of the above

11 / 50

11. The discharge coefficient of an ogee spillway is:

a) 1.2

b) 1.8

c) 2.02

d) 3.7

12 / 50

12. A rectangular channel is said to be wide if

a) width is five times the depth of flow

b) width is five times the depth of flow

c) width is more than ten times the depth of the flow

d) none of the above

13 / 50

13. The methods used for drilling a tube well in compacted rock materials is

a) wash boring

b) percussion method

c) hydraulic rotary

d) all of the above

14 / 50

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

a) impervious cut off

b) none of the above

c) chimney drain

d) horizontal blanket

15 / 50

15. *The phenomenon of salts coming up in solution and forming a layer of crust on the surface after the evaporation of water is known as

a) reclamation

b) leaching

c) efflorescence

d) salinity

16 / 50

16. Vertical drop fall is satisfactory for a drop up to

a) 0.5 m

b) 1.0 m

c) 1.5 m

d) 2.0 m

17 / 50

17. A weir constructed to divert part or all of the water from the stream into a different course is called

a) free weir

b) intake weir

c) submerged weir

d) none of the above

18 / 50

18. *The consumptive use of water for a crop

a) is measured as the volume of water per unit area

b) is measured as the depth of water on the irrigated area

c) may be supplied partly by precipitation and partly by irrigation

d) all of the above

19 / 50

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

a) roughness of the bed

b) roughness of the sides

c) both (a) and (b) above

d) none of the above

20 / 50

20. *Economic height of a dam is

a) very low

b) very high

c) corresponds to the minimum cost of a dam per unit of storage

d) none of the above

21 / 50

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

a) 3H / 4π above the base

b) 4H / 3π above the base

c) 4H / 3π below the water surface

d) 3H / 4π below the water surface

22 / 50

22. *Site of the head works is good when

a) it is situated on a river bend

b) it is close to the irrigated area

c) good foundation is available for the structure

d) both B and C above

23 / 50

23. The upstream face of an earthen dam is

a) a flow line

b) a phreatic line

c) a cubic parabola

d) none of the above

24 / 50

24. The shape of the lined canal recommended by ISI is

a) triangular

b) rectangular

c) parabolic

d) trapezoidal

25 / 50

25. The top of the capillary zone

a) lies below the water table at every point

b) lies above the water table at every point

c) coincides with the water table at every point

d) none of the above

26 / 50

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

a) depends on d/b ratio

b) depends on b/d ratio

c) cannot exceed unity

d) can be zero

27 / 50

27. A contour canal

a) irrigates only on one side

b) is most suitable in hilly areas

c) is generally aligned parallel to the contour of the area

d) all of the above

28 / 50

28. *The dead storage in a reservoir is provided to

a) accumulate the soil trapped in the reservoir

b) mitigate the flood

c) increase the useful life period

d) all of the above

29 / 50

29. *Mean velocity of the canal should never be

a) less than the critical velocity

b) more than the critical velocity

c) equal to the critical velocity

d) none of the above

30 / 50

30. *A diversion head work is constructed to

a) raise the water level at the head of the canal

b) regulate the intake of water into the canal

c) reduce fluctuations in the supply level of the river

d) all of the above

31 / 50

31. The fall is designed and constructed to satisfy the condition that

a) the velocity of approach should be minimum

b) it should be able to admit variations of water levels in the canal

c) bed, bank, and downstream position should be safe against erosion due to the excess energy of flow

d) all of the above

32 / 50

32. *The discharge through a channel is maximum when

a) m = d/3

b) m = b/2

c) m = d

d) m = 1.5d

33 / 50

33. 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

a) ogee spillway

b) s-spillway

c) oval spillway

d) zig-zag spillway

34 / 50

34. *Drop structures in the canal are provided for

a) providing a bridge

b) energy dissipation

c) maintaining ground slope

d) creating high velocity

35 / 50

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

a) higher level

b) same level

c) lower level

d) all of the above

36 / 50

36. 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

a) aqueduct

b) super passage

c) syphon aqueduct

d) none of the above

37 / 50

37. *Lime concrete lining is used

a) when the velocity of flow is below 2 m/sec

b) in irrigation channels with capacities up to 200 cumecs

c) where economy is required

d) all of the above

38 / 50

38. In a gravity canal, F.S.L is always

a) at the ground level

b) below the ground level

c) a few cm above the ground level

d) 4 to 5 meters above the ground level

39 / 50

39. *When the bed level of the canal is higher than the HFL of the drainage, then the cross drainage work is known as

a) an aqueduct

b) syphon aqueduct

c) canal syphon

d) super passage

40 / 50

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

a) flood control

b) to keep the channel in good shape by sufficient disposal of suspended and bed load

c) to provide sufficient depth of water in navigable channels during low water position

d) all of the above

41 / 50

41. For irrigation purposes, the pH value of water should be

a) between 3 and 6

b) between 6 and 8.5

c) between 8.5 and 11

d) more than 11

42 / 50

42. The discharge capacity of the undersluice is

a) twice the maximum discharge of the off-taking canal

b) 20% of maximum flood discharge

c) maximum winter discharge

d) greatest of all of the above

43 / 50

43. The discharge coefficient of an ogee spillway:

a) depends upon the depth of approach and upstream slope

b) depends upon downstream apron and submergence

c) both (a) and (b) of above

d) none of the above

44 / 50

44. A counterbalance is

a) a horizontal benching provided on the outer slope

b) a vertical benching provided on the outer edge of the bank

c) a horizontal benching provided on the inside slope

d) a vertical benching provided on the inner edge of the bank

45 / 50

45. The bed of a canal is lowered in the case of

a) level crossing

b) canal siphon

c) siphon aqueduct

d) none of the above

46 / 50

46. Percolation loss is less in the case of

a) sandy soil

b) black cotton soil

c) silty soil

d) all of the above

47 / 50

47. The primary cause of meandering is

a) excess of total charge during flood

b) minimum of total charge during flood

c) average of total charge during flood

d) none of the above

48 / 50

48. *Weed growth in a canal leads to

a) an increase in discharge

b) a decrease in silting

c) a decrease in discharge

d) an increase in the velocity of flow

49 / 50

49. The flow-mass curve is a graphical representation of

a) cumulative discharge and time

b) cumulative discharge volume and time in chronological order

c) discharge and time

d) none of the above

50 / 50

50. According to Lacey's theory, the silt supporting eddies are generated from

a) the bottom of the channel

b) the side of the channel

c) both (a) and (b) above

d) none of the above

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