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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be

900 mm
more than 1 m
750 mm
600 mm

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Concrete Technology and Design of Concrete Structures
Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is

M25
M15
M20
M10

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Concrete Technology and Design of Concrete Structures
When shear stress exceeds the permissible limit in a slab, then it is reduced by

Providing shear reinforcement
Using high strength steel
Increasing the depth
Using thinner bars but more in number

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Concrete Technology and Design of Concrete Structures
In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

compressive and tensile
both tensile
both compressive
tensile and compressive

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Concrete Technology and Design of Concrete Structures
Shrinkage of concrete depends uponi) humidity of atmosphereii) passage of timeiii) stress The correct answer is

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

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Concrete Technology and Design of Concrete Structures
The individual variation between test strength of sample should not be more than

±5% of average
±20% of average
± 15% of average
± 10% of average

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