Concrete Technology and Design of Concrete Structures
Select the incorrect statement...

None of these
For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system
Pretensioning system has greater certainty about its durability.
The loss of prestress is more in pre-tensioning system than in post-tensioning system.

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

High tensile steel is cheaper than mild steel
Elastic modulus of high tensile steel is more than that of mild steel
Carbon percentage in high carbon steel is less than that in mild steel
Elastic modulus of high tensile steel is nearly the same as 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 on i) top face parallel to the wall ii) top face perpendicular to the wall iii) bottom face paralleUo the wall iv) bottom face perpendicular to the wall The correct answer is

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

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Concrete Technology and Design of Concrete Structures
High carbon content in the steel causes

decrease in both tensile strength and ductility
increase in both tensile strength and ductility
increase in tensile strength but decrease in ductility
decrease in tensile strength but increase in ductility

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