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Concrete Technology and Design of Concrete Structures

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

size of aggregate
the air in the mix
time of transit
vater-cement ratio

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Concrete Technology and Design of Concrete Structures
When shear stress exceeds the permissible limit in a slab, then it is reduced by

Providing shear reinforcement
Using thinner bars but more in number
Increasing the depth
Using high strength steel

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Concrete Technology and Design of Concrete Structures
The centroid of compressive force, from the extreme compression fiber, in limit state design lies at a distance of (where xu is the depth of neutral axis at the limit state of collapse)

0.446 xu
0.367 xu
0.416 xu
0.573 xu

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Concrete Technology and Design of Concrete Structures
Ultimate strength of cold drawn high steel wires

increases with increase in diameter of bar
None of these
decreases with increase in diameter of bar
does not depend on diameter of bar

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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

tensile everywhere
compressive everywhere
partly compressive and partly tensile
zero

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Concrete Technology and Design of Concrete Structures
While designing the pile as a column, the end conditions are nearly

both ends fixed
one end fixed and other end hinged
one end fixed and other end free
both ends hinged

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