Concrete Technology and Design of Concrete Structures
The diameter of ties in a column should be

More than or equal to one fourth of diameter of main bar
More than 5 mm but less than one-fourth of diameter of main bar
More than 5 mm and also more than one-fourth of diameter of main bar
More than or equal to 5 mm

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Concrete Technology and Design of Concrete Structures
Assertion A : The load factor for live load is greater than that for dead load.Reason R : The live loads are more uncertain than dead loads.Select your answer based on the coding system given below :

A is false but R is true.
A is true but R is false.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.

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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
The loss of prestress is more in pre-tensioning system than in post-tensioning system.
Pretensioning system has greater certainty about its durability.

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