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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

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

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

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

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Concrete Technology and Design of Concrete Structures
If the storey height is equal to length of RCC wall, the percentage increase in strength is

10
20
30

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Concrete Technology and Design of Concrete Structures
Shrinkage of concrete depends uponi) humidity of atmosphereii) passage of timeiii) stressThe correct answer is

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

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Concrete Technology and Design of Concrete Structures
Which of the following has high tensile strength ?

cold drawn wires
plain hot rolled wires
all have same tensile strength
heat treated rolled wires

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Concrete Technology and Design of Concrete Structures
According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

4 times the least lateral dimension
3 times the least lateral dimension
The least lateral dimension
2 times the least lateral dimension

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