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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The approximate value of the ratio between direct tensile strength and flexural strength is

0.33
0.75
1
0.5

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Concrete Technology and Design of Concrete Structures
In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on
i) bottom face near counterfort
ii) top face near counterfort
iii) bottom face near centre of span
iv) top face near centre of span
The correct answer is

only (i)
both (ii) and (iii)
both (i) and (iv)
only (ii)

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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
angular
rounded
All of these

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Concrete Technology and Design of Concrete Structures
Which of the following has high tensile strength ?

heat treated rolled wires
cold drawn wires
plain hot rolled wires
all have same tensile strength

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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%
5%
10%
15%

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Concrete Technology and Design of Concrete Structures
Prestress loss due to friction occurs

None of these
in both post-tensioned and preten-sioned beams
only in post-tensioned beams
only in pretensioned beams

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