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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Workability of concrete is directly proportional to

All of above
Aggregate cement ratio
Grading of the aggregate
Time of transit

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Concrete Technology and Design of Concrete Structures
Diagonal tension in a beam

Increases below the neutral axis and decreases above the neutral axis
Decreases below the neutral axis and increases above the neutral axis
Is maximum at neutral axis
Remains same

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Concrete Technology and Design of Concrete Structures
In case of hand mixing of concrete, the extra cement to be added is

15%
5%
20%
10%

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Concrete Technology and Design of Concrete Structures
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

both (ii) and (iii)
only (i)
both (i) and (iv)
only (ii)

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Concrete Technology and Design of Concrete Structures
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

dependent on grade of concrete also
0.45 d
0.40 d
0.35 d

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Concrete Technology and Design of Concrete Structures
1% of voids in a concrete mix would reduce its strength by about

15%
20%
10 %
5%

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