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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Ultimate strength of cold drawn high steel wires

decreases with increase in diameter of bar
increases with increase in diameter of bar
does not depend on diameter of bar
None of these

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Concrete Technology and Design of Concrete Structures
The design yield stress of steel according to IS: 456-1978 is (where fy is the characteristic yield strength of steel)

0.67 fy
0.87 fy
0.57 fy
0.37 fy

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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 pretensioned beams
only in post-tensioned beams

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Concrete Technology and Design of Concrete Structures
Poisson’s ratio for concrete

decreases with richer mixes
increases with richer mixes
remains constant
None of these

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Concrete Technology and Design of Concrete Structures
The average permissible stress in bond for plain bars in tension is

decreased by 25% for bars in compression
increased by 10% for bars in compression
decreased by 10% for bars in compression
increased by 25% for bars in compression

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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 oni) bottom face near counterfortii) top face near counterfortiii) bottom face near centre of spaniv) top face near centre of span The correct answer is

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

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