In which place thermo electric pre stressing found to be more economical?

The chemical pre stressing is generally suited for elements like _______

In Hoyer’s system the projection of plugs left in concrete exceeds beyond _______

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

The period of cooling in thermo electric pre stressing is observed as _______

In pre tensioning system, type of prestressing tendon used is _______

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

The hydraulic jacks are the simplest and most widely used devices for providing prestress of _______