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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The load factors for live load and dead load are taken respectively as

2.2 and 2.2
1.5 and 1.5
2.2 and 1.5
1.5 and 2.2

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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
creep of concrete
elastic shortening of concrete
loss due to friction

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Concrete Technology and Design of Concrete Structures
The ratio of the diameter of reinforcing bars and the slab thickness is

1/4
1/5
1/8
1/6

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Concrete Technology and Design of Concrete Structures
Finer grinding of cement

affects only the early development of strength
both (a) and (b)
affects only the ultimate strength
does not affect the strength

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Concrete Technology and Design of Concrete Structures
The maximum value of hoop compression in a dome is given by (where, w = load per unit area of surface of dome R = radius of curvature d = thickness of dome)

wR/2d
wR / 4d
wR/d
2wR/d

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Concrete Technology and Design of Concrete Structures
Approximate value of shrinkage strain in concrete, is

0.03
3.0E-5
0.003
0.0003

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