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Concrete Technology and Design of Concrete Structures

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

retarders
workability admixtures
accelerators
air entraining agents

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

100 mm
40 mm
105 mm
50 mm

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Concrete Technology and Design of Concrete Structures
For a reinforced concrete section, the shape of shear stress diagram is

wholly parabolic
wholly rectangular
rectangular above neutral axis and parabolic below neutral axis
parabolic above neutral axis and rectangular below neutral axis

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Concrete Technology and Design of Concrete Structures
The permissible diagonal tensile stress in reinforced brick work is

about 0.1 N/mm²
0.3 N/mm² to 0.7 N/mm²
about 1.0 N/mm²
zero

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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)

0.367 xu
0.446 xu
0.416 xu
0.573 xu

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Concrete Technology and Design of Concrete Structures
In a ring beam subjected to uniformly distributed load
i) shear force at mid span is zero
ii) shear force at mid span is maximum
iii) torsion at mid span is zero
iv) torsion at mid span is maximum
The correct answer is

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

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