Following are some of the multiple choice questions on the **Irrigation Engineering** with answers that will help the students in developing their knowledge.

## Irrigation Engineering MCQ

### 1. The length and width of a meander and also the width of the river, vary roughly as

### 3. The sensitivity of a rigid module is

### 4. Which of the following canal structures is used to remove surplus water from an irrigation channel into a natural drain ?

### 5. The most suitable section of a lined canal, is

### 7. The uplift pressure on the face of a drainage gallery in a dam is taken as

### 9. Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey’s theory will be

### 10. For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is

### 11. The water face of the guide banks, is protected by

### 12. The uplift pressure on the roof of an inverted syphon, is maximum when

### 13. The useful moisture of soil, is equal to its

### 14. The ratio of the average load to the installed capacity of the plant whose reserve capacity is zero will be equal to

### 15. The consumptive use of water for a crop

### 16. A divide wall is provided

### 17. A multipurpose reservoir is the one which is

### 18. A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If ϕ index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is

### 19. The value of Sodium Absorption Ratio for high sodium water lies between

### 20. The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called

### 21. If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is

### 22. Which of the following types of rain gauges is used for measuring rain in remote hilly inaccessible areas ?

### 23. In gravity canals, F.S.L. is

### 24. Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less

### 25. Borrow pits should preferably be located in

### 26. If d is the depth of the aquifer through which water is flowing, then the relationship between permeability k and transmissible T is given by

### 27. If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

### 28. The length of a meander is the distance along the river between the tangent point of one curve to the tangent point of

### 29. Which of the following can be used as a meter fall ?

### 30. The depth of water required to bring the soil moisture content of a given soil upto its field capacity is called

### 31. Bed bars in a canal are provided

### 32. As compared to gravity dams, earthen dams

### 33. A fall in a canal bed is generally provided, if

### 34. The ratio of the discharge over a trapezoidal crest to a rectangular crest of Sarda falls of identical parameters, is

### 35. The width of a dowla is generally kept between 30 to 60 cm and its height above the road level should invariably be more than

### 36. The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called

### 37. The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called

### 38. The main function of a diversion head works of a canal from a river, is

### 39. The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be

### 40. The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is

### 41. The width of a meander belt is the transverse distance between

### 42. If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be

### 43. The uplift pressure on a dam can be controlled byi) constructing cutoff under upstream faceii) constructing drainage channels bet-ween the dam and its foundationiii) by pressure grouting in foundationThe corret answer is

### 44. The downstream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

### 45. For wave action in dams, the maximum height of freeboard is generally taken to be equal to (where hw is height of wave.)

### 46. The difference in level between the top of a bank and supply level in a canal, is called

### 47. If the irrigation efficiency is 80%, conveyance losses are 20% and the actual depth of watering is 16 cm, the depth of water required at the canal outlet, is

### 48. A minimum of 90 cm free board is provided if the discharge in the canal is between

### 49. If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

### 50. Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as

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