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Concrete Technology and Design of Concrete Structures

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

15%
5%
10%
20%

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

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

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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

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

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

elongated
rounded
angular
All of these

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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
M20
M15
M10

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Concrete Technology and Design of Concrete Structures
The factor of safety for

steel is lower than that for concrete
None of these
steel is higher than that for concrete
steel and concrete are same

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