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Irrigation Engineering Practice Test: Cross Drainage Work
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Cross Drainage Work topics include: Cross drainage work design and types, aqueducts and syphon aqueducts types, joints provision and water bars in rcc ducts. Cross drainage work is a structure that carries drainage water from a natural stream across a canal that intercepts the stream. It is constructed when a canal and a natural drain cross, preventing drain water from mixing with canal water.  Cross drainage work is important for irrigation engineering because it: Maintains water flow Prevents water from mixing in the canal and drainage systems Ensures that water bodies do not disrupt... Show more
Irrigation Engineering Practice Test: Cross Drainage Work
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25 Questions

1. A Super passage is the reverse of ______________
2. Calculate the depth of cut-off for scour holes for an irrigation channel of F.S.Q equal to 354 cumecs and H.F.Q of natural drainage equal to 600 cumecs. Assume the value of friction factor as 1.
3. What provides a permanent watertight seal during the whole range of joint movement?
4. The canal water flows freely under gravity in which of the following CD works?
5. The crossing arrangement preferably made at the junction of a huge canal and a river stream carrying a short-lived high flood discharge at almost equal bed levels is a __________
6. In a syphon aqueduct provided with a pucca bottom floor, the uplift will occur on __________
7. The selection of the CD works depends on?
i. Selecting canal alignment
ii. Position of water-table and availability of dewatering equipment
iii. Suitability of soil for embankment
iv. Availability of funds
8. Joint sealing compounds are impermeable ductile materials which are required to ___________________
9. Which of the following is a movement joint with complete discontinuity in both reinforcement and concrete and intended to accommodate either expansion or contraction of the structure?
10. The drainage water is sometimes allowed to join the canal water to augment canal supplies through a hydraulic structure is called as ________________
11. The number of inlets should be equal to the number of outlets.
12. The greater is the fluming, the greater is the length of upstream and downstream transition wings.
13. Which of the following is usually adopted for contraction and construction joints?
14. In order to reduce the CD works, the artificial canals are generally aligned along the ridgeline.
15. Which of the following CD works carry drainage over the canal?
16. In reinforced concrete floors, the movement joints should normally be spaced at a maximum spacing of ____________
17. The expansion joints in floors and walls should normally be provided at a spacing of not more than ___________
18. What is Lacey’s equation for fixing the approximate value of the required waterway for the drain?
19. Which of the following is a disadvantage of CD works carrying the canal over the discharge?
20. Inlets and Outlets are inferior to aqueduct or super-passage type of work.
21. A siphon aqueduct is constructed at a canal crossing site where drainage HFL was 212.2 m by allowing an afflux of 0.4 m at high flood discharge. At this site, the water level downstream of the crossing at the same high flood will be _________
22. To reduce the cost of the CD works we resort to _____
23. Which of the following statement is not correct about canal syphon?
24. The relative bed levels of the canal and the drainage may be changed and manipulated by _________________
25. What is the most common metal used for water stops?