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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

shrinkage of concrete
elastic shortening of concrete
creep of concrete
loss due to friction

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Concrete Technology and Design of Concrete Structures
For a reinforced concrete section, the shape of shear stress diagram is

wholly parabolic
rectangular above neutral axis and parabolic below neutral axis
parabolic above neutral axis and rectangular below neutral axis
wholly rectangular

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

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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

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

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

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Concrete Technology and Design of Concrete Structures
The slab is designed as one way if the ratio of long span to short span is

between 1 and 1.5
between 1.5 and 2
less than 1
greater than 2

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