Concrete Technology and Design of Concrete Structures
In prestressed concrete

forces of tension and compression change but lever arm remains unchanged
both forces of tension and compres-sion as well as lever arm remain unchanged
both forces of tension and compres-sion as well as lever arm change
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
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 :

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

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