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Concrete Technology and Design of Concrete Structures

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

20%
5%
10 %
15%

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Concrete Technology and Design of Concrete Structures
Modulus of elasticity of steel as per IS : 456-1978 shall be taken as

20 kN/cm²
200 kN/cm²
200kN/mm²
2xl06N/cm²

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Concrete Technology and Design of Concrete Structures
Normally prestressing wires are arranged in the

upper part of the beam
anywhere
lower part of the beam
center

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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

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

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Concrete Technology and Design of Concrete Structures
The depth of footing for an isolated column is governed by i) maximum bending moment ii) shear force iii) punching shear The correct answer is

(i), (ii) and (iii)
(i) and (ii)
only (i)
(i) and (iii)

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Concrete Technology and Design of Concrete Structures
Which of the following R.C. retaining walls is suitable for heights beyond 6m?

All of these
counterfort type
T-shaped wall
L-shaped wall

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