Question 11. A sloping apron is provided partly above the river bed and partly below the river bed in case of ____________________________

Question 12. A troublesome and oscillating hydraulic jump is normally met in cases of _____________

Question 13. When the TWC lies below the JHC at all discharges, the problem can be solved by which of the following provisions?
i. Constructing a sloping apron above the river bed
ii. Provision of roller bucket type of energy dissipator
iii. Provision of a ski-jump bucket
iv. A sloping apron below the river bed
v. Construction of a subsidiary dam
vi. A sloping apron partly above and partly below the river bed

Question 14. A very steady and stable hydraulic jump is usually formed in the flows involving the approaching Froude number in the range of _____________________

Question 15. Standard USBR stilling basin-II is useful for energy dissipation at the bottom of the overflow structure, if the approaching Froude number is ________________

Question 16. An ogee spillway of a concrete gravity dam having FRL of 328 m and MWL of 340 m is provided with vertical gates between piers erected on the spillway. The effective length of the spillway is 60 m. The discharge through the spillway when gates are opened up to the actual reservoir level of 331.0 m will be_____________

Question 17. Which of the following gate is also called flush boards?

Question 18. Which one of the following gate is not suitable for curved crests?

Question 19. The working of Reinold’s gate is automatic.

Question 20. The most common vertical lift gates in modern days is _________________