Concrete Technology and Design of Concrete Structures
In prestressed concrete

both forces of tension and compres-sion as well as lever arm change
both forces of tension and compres-sion as well as lever arm remain unchanged
forces of tension and compression change but lever arm remains unchanged
forces of tension and compressions remain unchanged but lever arm changes with the moment

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Concrete Technology and Design of Concrete Structures
Select the correct statement for

Elastic modulus of high tensile steel is nearly the same as that of mild steel
High tensile steel is cheaper than mild steel
Carbon percentage in high carbon steel is less than that in mild steel
Elastic modulus of high tensile steel is more than that of mild steel

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Concrete Technology and Design of Concrete Structures
The main reinforcement in the toe of a T- shaped R C. retaining wall is provided oni) top face parallel to the wallii) top face perpendicular to the walliii) bottom face paralleUo the walliv) bottom face perpendicular to the wallThe correct answer is

(iii) and (iv) are correct
(i) and (ii) are correct
only (ii) is correct
only (iv) is correct

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