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Concrete Technology and Design of Concrete Structures

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

50 mm
105 mm
40 mm
100 mm

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

workability
the unit weight
the effects of temperature variations
strength

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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

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

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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
compressive everywhere
tensile everywhere
partly compressive and partly tensile

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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
For a cantilever of effective depth of 0.5m, the maximum span to satisfy vertical deflection limit is

5 m
4 m
6 m
3.5 m

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