Concrete Technology and Design of Concrete Structures - Civil Engineering Questions and Answers

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In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on
i) bottom face near counterfort
ii) top face near counterfort
iii) bottom face near centre of span
iv) top face near centre of span
The correct answer is

only (i)

only (ii)

both (i) and (iv)

both (ii) and (iii)

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The main reinforcement in the toe of a T- shaped R C. retaining wall is provided on
i) top face parallel to the wall
ii) top face perpendicular to the wall
iii) bottom face paralleUo the wall
iv) bottom face perpendicular to the wall
The correct answer is

only (ii) is correct

(i) and (ii) are correct

(iii) and (iv) are correct

only (iv) is correct

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Select the correct statement

Elastic modulus of high tensile steel is nearly the same as that of mild steel

Elastic modulus of high tensile steel is more than that of mild steel

Carbon percentage in high carbon steel is less than that in mild steel

High tensile steel is cheaper than mild steel

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Select the incorrect statement

Lean mixes bleed more as compared to rich ones.

Bleeding can be minimized by adding pozzuolana finer aggregate.

Bleeding can be increased by addition of calcium chloride.

none of the above

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Select the incorrect statement

The loss of prestress is more in pre-tensioning system than in post-tensioning system.

Pretensioning system has greater certainty about its durability.

For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system

none of the above

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To minimize the effect of differential settlement, the area of a footing should be designed for

Dead load only

Dead load + live load

Dead load + fraction of live load

Live load + fraction of dead load

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The load carrying capacity of a helically reinforced column as compared to that of a tied column is about

5% less

10% less

5% more

10% more

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If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.35 d

0.40 d

0.45 d

dependent on grade of concrete also