Concrete Technology and Design of Concrete Structures
In prestressed concrete

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
both forces of tension and compres-sion as well as lever arm change

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

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