After the tensioning operation, the space between the tendons and the ducts are _______

The linear expansion of the cement in chemical pre stressing is about _______

The electrical devices are commonly used for tensioning of _______

The drawback of Lee-McCall system is it cannot use _______

Which is one of the systems used for pretensioning?

Which of the following is a disadvantage of Freyssinet system?

When the concrete attains sufficient strength, which elements are released?

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