Hydraulic Structures for Irrigation MCQs

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1. : Hydraulic structures are mainly constructed for:
(A) Soil fertility
(B) Water control, diversion, and storage
(C) Crop rotation
(D) Groundwater recharge only

2. : A diversion headwork constructed across a river mainly serves to:
(A) Store water permanently
(B) Raise water level and divert into canals
(C) Generate electricity only
(D) Prevent floods only

3. : A barrage differs from a weir because:
(A) A barrage has adjustable gates
(B) A weir has adjustable gates
(C) Both are the same
(D) A barrage stores water in a reservoir

4. : The main purpose of a canal head regulator is to:
(A) Control sediment entry into canal
(B) Control discharge into canal
(C) Regulate water level in canal
(D) All of the above

5. : A cross regulator is provided in canals to:
(A) Control discharge
(B) Maintain pond level for offtaking canals
(C) Prevent floods
(D) Both (A) and (B)

6. : Which of the following is not a cross-drainage work?
(A) Aqueduct
(B) Syphon aqueduct
(C) Canal fall
(D) Super passage

7. : An aqueduct is a structure where:
(A) Drain passes over canal
(B) Canal passes over drain
(C) Drain passes below canal
(D) Canal passes below drain

8. : In a syphon aqueduct:
(A) Canal passes over drain
(B) Drain passes over canal
(C) Drain passes below canal under pressure flow
(D) Canal passes below drain under pressure flow

9. : A canal fall is constructed to:
(A) Raise water level
(B) Absorb excess energy of water when canal bed drops
(C) Prevent flooding
(D) Divert flow into canal

10. : The most common type of fall used in irrigation canals is:
(A) Vertical drop fall
(B) Trapezoidal notch fall
(C) Sarda fall
(D) Ogee fall

11. : Outlets in irrigation canals are provided to:
(A) Regulate water to field channels
(B) Store water
(C) Stop sediment
(D) Increase canal discharge

12. : A proportional outlet supplies water to field channel:
(A) In direct proportion to discharge in canal
(B) Constant discharge always
(C) Constant head only
(D) By gate opening only

13. : Which of the following is a rigid weir structure?
(A) Crump weir
(B) Ogee weir
(C) Sarda fall
(D) Both (A) and (B)

14. : The main function of a barrage under sluice is to:
(A) Pass flood water and silt into river downstream
(B) Store water in reservoir
(C) Increase canal discharge
(D) Stop water from flowing

15. : A canal escape is provided to:
(A) Remove surplus water from canal to drain
(B) Increase discharge
(C) Reduce seepage
(D) Store water in canal

16. : A syphon is used in canals to:
(A) Pass canal water over drain
(B) Pass canal water under drain with pressure flow
(C) Store water
(D) Prevent seepage

17. : A head regulator is provided at the head of:
(A) Canal
(B) Dam
(C) Reservoir
(D) Drainage channel

18. : The most suitable structure to raise water level temporarily in a river is:
(A) Barrage
(B) Weir
(C) Dam
(D) Spillway

19. : Which hydraulic structure is mainly meant for flood control and power generation?
(A) Barrage
(B) Diversion weir
(C) Dam
(D) Cross regulator

20. : The crest level of a barrage is kept:
(A) High above river bed
(B) At same level as canal bed
(C) Low, near river bed level
(D) Equal to full reservoir level

21. : The ratio of crest length of weir to effective length of barrage is known as:
(A) Efficiency ratio
(B) Head loss ratio
(C) Silt factor
(D) Pond level ratio

22. : A cross-drainage structure where drain water flows under gravity below the canal without pressure flow is called:
(A) Aqueduct
(B) Canal syphon
(C) Super passage
(D) Inlet and outlet

23. : Falls on canals are generally spaced at:
(A) Every 100 m
(B) Where bed slope changes abruptly
(C) Regular intervals always
(D) Every outlet

24. : A silt excluder in a barrage is constructed:
(A) On downstream side
(B) On upstream side to prevent silt entry into canal
(C) On canal head regulator
(D) On cross regulator

25. : The energy dissipating arrangement below hydraulic structures is usually:
(A) Drop wall
(B) Stilling basin with baffle blocks
(C) Barrage gates
(D) Canal fall crest