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
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
High carbon content in the steel causes

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

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