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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The effect of creep on modular ratio is

to decrease it
either to decrease or to increase it
to increase it
to keep it unchanged

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

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Concrete Technology and Design of Concrete Structures
The purpose of reinforcement in pre-stressed concrete is

To provide adequate bond stress
All of these
To impart initial compressive stress in concrete
To resist tensile stresses

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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)

0.87 fy
0.37 fy
0.67 fy
0.57 fy

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Concrete Technology and Design of Concrete Structures
In a spherical dome the hoop stress due to a concentrated load at crown is

partly compressive and partly tensile
tensile everywhere
zero
compressive everywhere

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Concrete Technology and Design of Concrete Structures
According to IS : 456- 1978, minimum slenderness ratio for a short column is

more than 24
less than 18
less than 12
between 18 and 24

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