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

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

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

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

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

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