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

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Concrete Technology and Design of Concrete Structures
In a spherical dome subjected to concentrated load at crown or uniformly distributed load, the meridional force is always

tensile or compressive
zero
compressive
tensile

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Concrete Technology and Design of Concrete Structures
Normally prestressing wires are arranged in the

center
lower part of the beam
upper part of the beam
anywhere

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Concrete Technology and Design of Concrete Structures
The minimum cover to the ties or spirals should not be less than

25 mm
15 mm
20 mm
50mm

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Concrete Technology and Design of Concrete Structures
For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine’s theory

is always greater than 1
can be more than 1
is always less than 1
can be less than 1

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

air entraining agents
retarders
accelerators
workability admixtures

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