Weir and Barrage - MCQ - Civil Engineering

Weir and Barrage – MCQ

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

View Answer

Sheet piles

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

View Answer

Equipotential line.

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

View Answer

Invert filter.

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

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

View Answer

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 provide for the barrage piers
b) Sheet piles should be provided only in 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.

View Answer

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

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

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

View Answer

a) Hydraulic gradient or percolation coefficient

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

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

View Answer

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