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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. Which of the following can be used as support for an effective joint sealing compound in floor and floor joints?
2. Which of the following statement is not correct about canal syphon?
3. In case of the sealing joint, the lower part of the joint is occupied by joint filler.
4. To reduce the cost of the CD works we resort to _____
5. The number of inlets should be equal to the number of outlets.
6. Which of the following is not a movement joint?
7. Which of the following is a movement joint with deliberate discontinuity but no initial gap?
8. Which CD work is generally adopted when the drainage discharge is small and the drain crosses the canal with its bed level equal to or slightly higher than the canal FSL?
9. Inlets and Outlets are inferior to aqueduct or super-passage type of work.
10. Joint sealing compounds are impermeable ductile materials which are required to ___________________
11. The permissible velocity through the barrels is generally limited to _____________
12. The drainage water is sometimes allowed to join the canal water to augment canal supplies through a hydraulic structure is called as ________________
13. What is the maximum expansion or contraction allowed for the joint filler material with an initial gap of about 30 mm?
14. Which of the following is sometimes used in expansion joints to avoid the risk of fault in an embedded water bar?
15. Which of the following is a disadvantage of CD works carrying drainage over the canal?
16. Calculate the value of hydraulic mean radius for a channel designed by Lacey’s theory which has a mean velocity of 1m/sec. The silt factor can be taken as unity.
17. In which of the following arrangement, the perennial drainage discharge is advantageously used?
18. The expansion joints in floors and walls should normally be provided at a spacing of not more than ___________
19. The use of sealing compounds for vertical joints is very successful.
20. In a siphon aqueduct, the worst condition of uplift on the floor occurs when ________
21. 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 __________
22. 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
23. What is the most common metal used for water stops?
24. The head loss through a siphon barrel is usually given by Unwin’s formula by neglecting velocity of approach as HL = [1 + F1 + F2. L/R] V2/2g, where F1 and F2 respectively represent the coefficient of head losses due to?
25. In reinforced concrete floors, the movement joints should normally be spaced at a maximum spacing of ____________