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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.40 d
0.35 d
dependent on grade of concrete also
0.45 d

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Concrete Technology and Design of Concrete Structures
Ratio of permissible stress in direct compression and bending compression is

between 1.5 and 2.0
between 1 and 1.5
greater than 2
less than 1

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

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Concrete Technology and Design of Concrete Structures
According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is

0.55 d
0.43 d
0.85 d
0.68 d

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Concrete Technology and Design of Concrete Structures
Minimum thickness of load bearing RCC wall should be

50 mm
40 mm
105 mm
100 mm

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Concrete Technology and Design of Concrete Structures
The strength of concrete after one year as compared to 28 days strength is about

20 to 25% more
15 to 20% more
10 to 15% more
25 to 50% more

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