Q. The most ideal condition for energy dissipation in the design of spillways is the one when the tail-water rating curve coincides with the jump rating curve at all discharge.

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Q. When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

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Q. The device which does not help in energy dissipation at the bottom of a hydraulic structure over which water spills is ________________

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Q. The formation of hydraulic jump at the foot of a spillway is one of the common methods of energy dissipation because ______________________

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Q. A ski-jump bucket is also known as _____________________

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Q. The percentage of energy dissipation in a hydraulic jump increases with the increase in the Froude number.

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Q. Which of the following stilling basin help in stabilizing the flow and improve the jump performance?

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Q. What is the expected solution for the case when the T.W.C is lying above the J.H.C curve at all discharges?

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

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Q. 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

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

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

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

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Q. When the Froude number is in the range of 2.5 to 4.5, the jump is ____________________

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Q. Which of the following stilling basin is applicable to only rectangular cross-sections?

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Q. The Froude number of a hydraulic jump is 5.5. The jump can be classified as ____________

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Q. Standard stilling basin is provided at the toe of a dam spillway for energy dissipation is usually provided with auxiliary devices like chute blocks and dentated sills for the basic purpose of reducing the length of the stilling basin from about ________________

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Q. In the case of dam spillways, the approaching Froude number usually lies in the range of __________

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Q. _____________________ are suitable only for low spillways or weirs.

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Q. Which of the following helps in dissipating the residual energy and to reduce the length of the jump or the basin?

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