A low gravity dam of elementary profile made up of concrete of relative density 2.57 and safe allowable stress of foundation material 4.2 MPa. What is the maximum height of the dam without considering the uplift force?

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

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

Consider the following statements related to uplift pressure in gravity dams: 1. A drainage gallery reduces the uplift pressure at all levels below the gallery. 2. A drainage gallery below upstream water level reduces the uplift pressure at all levels below the upstream water level. 3. A grout curtain near the heel reduces seepage and uplift pressure everywhere on the gravity dam whatever the upstream water level. Which of the above statements are correct?

A

2 and 3 only

B

1 and 2 only

C

1 and 3 only

D

1, 2 and 3

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

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

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

Neha was solving a problem in which subtraction of 673–257 was required. She said, "257 plus 100 will be 357, 457, 557, 657. So, 257 plus 400 is 657". "Now 657 plus 10 is 667, 677, so, 657 plus 20 is 677 and 4 less in 677 is 673. "Therefore, 400 plus 20 minus 4 is 416". Hence 673–257 is 416. Which of the following statements is most appropriate for the strategy of Neha?

A

It shows Neha is able to use her conceptual understanding of addition and subtraction in developing her own personal algorithm.

B

Neha does not know formal algorithm of subtraction.

C

Neha is unnecessarily mixing the concept of addition in solving a problem on subtraction.

D

It is an informal strategy hence cannot used in written tests.

Calculate the value of minimum base width for an elementary triangular concrete gravity dam supporting 72 m height of reservoir water and full uplift? (Take specific gravity of concrete as 2.4 and coefficient of friction as 0.7)

A

36.28 m

B

39.77 m

C

51.5 m

D

73.5 m

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be

A

400 MPa

B

500 MPa

C

900 MPa

D

1400 MPa

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum shear stress will be

A

400 MPa

B

500 MPa

C

900 MPa

D

1400 MPa

A low gravity dam of elementary profile made up of concrete of relative density 2.57 and safe allowable stress of foundation material 4.2 MPa. What is the maximum height of the dam without considering the uplift force?

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