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Concrete Technology and Design of Concrete Structures

Concrete Technology and Design of Concrete Structures
The purpose of reinforcement in pre-stressed concrete is

To resist tensile stresses
To provide adequate bond stress
All of these
To impart initial compressive stress in concrete

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Concrete Technology and Design of Concrete Structures
The individual variation between test strength of sample should not be more than

± 10% of average
± 15% of average
±5% of average
±20% of average

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Concrete Technology and Design of Concrete Structures
Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

53 MPa and 42 MPa
42 MPa and 35 MPa
42 MPa and 53 MPa
35 MPa and 42 MPa

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Concrete Technology and Design of Concrete Structures
Which of the following R.C. retaining walls is suitable for heights beyond 6m?

T-shaped wall
L-shaped wall
All of these
counterfort type

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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)

0.416 xu
0.446 xu
0.367 xu
0.573 xu

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Concrete Technology and Design of Concrete Structures
A higher modular ratio shows

lower compressive strength of concrete
lower tensile strength of steel
higher tensile strength of steel
higher compressive strength of con-crete

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