The Hoyer’s method of prestressing is done by _______

Hoyer’s system of pre tensioning is generally adopted for _______

The thermo electric pre stressing, initial stress in tendons ranges between _______

The yield stress relieved in wires is about _______

In post tensioning, the concrete units are cast by _______

In Lee-McCall system, the prestressing tendons are in the form of _______

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

The electrical devices are commonly used for tensioning of _______