In Gifford-Udall system, the number of methods for prestressing members is?

The tensioning of oval section ribbed wires with an ultimate tensile strength was adopted in _______

The yield stress relieved in wires is about _______

The use of bar tendons with threaded anchorages reduces the possibility of _______

The method of chemical pre stressing is not suited for _______

The cables are formed by arrangement of wires or strands in _______

The tensile stresses developed in steel by the expansion of concrete are about _______

The Freyssinet system of prestressing involves the arrangement of wires of number?