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Concrete Technology and Design of Concrete Structures

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
0.37 fy
0.57 fy
0.87 fy

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

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Concrete Technology and Design of Concrete Structures
Most common method of prestressing used for factory production is

Long line method
Freyssinet system
Magnel-Blaton system
Lee-Macall system

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

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Concrete Technology and Design of Concrete Structures
Air entrainment in the concrete increases

the unit weight
strength
workability
the effects of temperature variations

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Concrete Technology and Design of Concrete Structures
The depth of footing for an isolated column is governed byi) maximum bending momentii) shear forceiii) punching shear The correct answer is

(i), (ii) and (iii)
(i) and (iii)
only (i)
(i) and (ii)

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