The maximum permissible eccentricity, for no tension at the base of the gravity dam, is Where B = base width of the dam

Consider the following statements in respect of dams: 1. In a gravity dam, a grout curtain is provided near the toe to reduce the exit gradient. 2. A drainage gallery with its drainage pipe system provided in a gravity dam reduces the uplift pressure at all levels below the upstream water level. 3. An earthquake acceleration of 0.1 g acting vertically downward causes a decrease of 10% in the limit weight of concrete and of water in a gravity dam. 4. The Tehri dam is a gravity dam. Which of the above statements are correct?

A

1 and 3 only

B

1 and 4 only

C

2 and 3 only

D

2 and 4 only

A concrete gravity dam having a maximum reservoir level at 200 m and the RL of the bottom of the dam 100 m. The maximum allowable compressive stress in concrete is 3000 KN/m2 and the specific gravity of concrete is 2.4. Calculate the height of the dam and check whether it is a high dam or low dam.

A

H = 90 m High gravity dam

B

H = 90 m Low gravity dam

C

H = 214.2 m High gravity dam

D

H = 214.2 m Low gravity dam

From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
P. The engineering stress-strain curves in tension and compression are identical.
Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.

A

P, Q

B

Q, R

C

Q, S

D

R, S

The maximum permissible eccentricity for no tension at the base of a gravity dam is

A

$$\frac{{\text{B}}}{2}$$

B

$$\frac{{\text{B}}}{3}$$

C

$$\frac{{\text{B}}}{4}$$

D

$$\frac{{\text{B}}}{6}$$

In a gravity dam of base width b, the maximum permissible value of eccentricity e is

A

^b/₈

B

^b/₄

C

^b/₃

D

^b/₆

The ratio of base width 'b' to height 'h' of an elementary profile of a gravity dam, from 'no tension' consideration, is given by Where G = specific gravity of dam material K = uplift pressure intensity and μ = coefficient of friction

A

$\frac{1}{{\sqrt {G - K} }}$

B

$\frac{1}{{(G - K)\mu }}$

C

$\frac{1}{{\sqrt {G - K} \mu }}$

D

$\frac{1}{{\sqrt {({G^2} - {K^2})} }}$

The ratio of base width ‘b’ to height ‘h’ of an elementary profile of a gravity dam from ‘no tension’ consideration is given by Where G = specific gravity of dam material K = uplift pressure intensity μ = coefficient of friction

A

$1/\sqrt{(G - K)}$

B

1/(G - K)μ

C

1

D

$1/\sqrt{(G^2 - K^2)}$

The base width of a solid gravity dam is 35 m and the specific gravity of dam material is 2.45. What is the approximate allowable height of the dam having an elementary profile without considering the uplift?

A

64.68 m

B

54.80 m

C

164 m

D

80 m

According to the International Commission on Education for the Twenty-first Century headed by Jacques Delors, which of the following main tensions will be witnessed during the 21st century ? A. The tension between the global and the local B. The tension between tradition and modernity C. The tension between the spiritual and the material D. The tension between the poor and the rich E. The tension between the developed and the developing societies Choose the correct answer from the options given below:

A

A, B and C only

B

B, C and D only

C

C, D and E only

D

A, D and E only

Calculate the eccentricity of a trapezoidal dam with a distance between the centre of gravity and point where the resultant cuts the base is 5m. The bottom width of the dam is 3m.

A

2.5m

B

3.5m

C

4.5m

D

5m

The maximum permissible eccentricity, for no tension at the base of the gravity dam, is Where B = base width of the dam

Related Questions