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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
In order to obtain the best workability of concrete, the preferred shape of aggregate is

All of these
angular
rounded
elongated

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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

20%
15%
5%
10%

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Concrete Technology and Design of Concrete Structures
The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on

bottom face perpendicular to wall
top face perpendicular to wall
None of these
both top and bottom faces perpendicular to wall

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Concrete Technology and Design of Concrete Structures
Strength of concrete increases with

increase in fineness of cement
decrease in size of aggregate
decrease in curing time
increase in water-cement ratio

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Concrete Technology and Design of Concrete Structures
Sinking of an intermediate support of a continuous beami) reduces the negative moment at supportii) increases the negative moment at supportiii) reduces the positive moment at center of spaniv) increases the positive moment at center of span The correct answer is

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

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Concrete Technology and Design of Concrete Structures
According to Whitney’s theory, ultimate strain of concrete is assumed to be

0.5%
0.4%
0.3%
0.6%

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