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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
A continuous beam is deemed to be a deep beam when the ratio of effective span to overall depth (1/D) is less than

4.5
5.5
3.5
2.5

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Concrete Technology and Design of Concrete Structures
The effect of adding calcium chloride in concrete is i) to increase shrinkage ii) to decrease shrinkage iii) to increase setting time iv) to decrease setting time The correct answer is

(ii) and (iii)
(i)and(iv)
(ii) and (iv)
(i) and (iii)

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Concrete Technology and Design of Concrete Structures
The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse)

0.367 xu
0.416 xu
0.446 xu
0.573 xu

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Concrete Technology and Design of Concrete Structures
If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to

xc
xv
Tv + Tc

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beam
i) reduces the negative moment at support
ii) increases the negative moment at support
iii) reduces the positive moment at center of span
iv) increases the positive moment at center of span
The correct answer is

(i) and (iv)
(i) and (iii)
(ii) and (iv)
(ii) and (iii)

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Concrete Technology and Design of Concrete Structures
Increase in the moisture content in concrete

reduces the strength
does not change the strength
increases the strength
All of these

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