Weir and Barrage - MCQ || Hydraulic Structure

Weir and Barrage – MCQ

1. To lengthen the path of seepage flow _ are provided on the cut-off walls of the weir or barrage

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Sheet piles

2. On every streamline there may be a point of equal residual head. If all these points are joined, then the line is known as

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Equipotential line.

3. To allow the seepage water to escape without dislocating the soil particles on the downside of the weir the _ is provided

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Invert filter.

4. Which of the following reasons for the failure of the weir and barrage on the permeable foundation

a) By scouring
b) By piping
c) By uplift pressure
d) All of these

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d) All of these

5. Which of the following precautions can be taken to prevent weir and barrage failure on permeable foundation

a) Shallow foundation should be provided for the barrage piers
b) Sheet piles should be provided only on the upstream side
c) Sheet piles should be provided on the upstream and downstream side
d) Loose talus should be provided as possible as small in size.

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c) Sheet piles should be provided on the upstream and downstream side

6. The loss of head per unit creep length is known as

a) Hydraulic gradient
b) Creep coefficient
c) Potential drop
d) Lane’s coefficient

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a) Hydraulic gradient or percolation coefficient

7. If ‘H’ is the depth of water on the upstream side of the weir and ‘L’ is the creep length, then the Bligh’s creep coefficient will be

a) H/L
b) L/H
c) HL
d) None

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b) L/H

8. According to Bligh’s theory, which of the following relation indicates that there will be no danger of piping

a) $\frac{H}{L}\leq \frac{1}{C}$
b) $\frac{H}{L}\geq \frac{1}{C}$
c) $\frac{H}{L} > \frac{1}{C}$ .
d) None