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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
0.40 d
0.35 d
dependent on grade of concrete also

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Concrete Technology and Design of Concrete Structures
Workability of concrete is directly proportional to

Aggregate cement ratio
All of above
Time of transit
Grading of the aggregate

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Concrete Technology and Design of Concrete Structures
The approximate value of the ratio between direct tensile strength and flexural strength is

0.5
0.75
0.33
1

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Concrete Technology and Design of Concrete Structures
Modulus of elasticity of steel as per IS : 456-1978 shall be taken as

200kN/mm²
2xl06N/cm²
20 kN/cm²
200 kN/cm²

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Concrete Technology and Design of Concrete Structures
Admixtures which cause early setting, and hardening of concrete are called

accelerators
workability admixtures
retarders
air entraining agents

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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

zero
tensile everywhere
partly compressive and partly tensile
compressive everywhere

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