Long line method

Freyssinet system

Magnel-Blaton system

Lee-Macall system

The loss of prestress is more in pre-tensioning system than in post-tensioning system.

Pretensioning system has greater certainty about its durability.

For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system

none of the above

elastic shortening of concrete

shrinkage of concrete

creep of concrete

loss due to friction

only in post-tensioned beams

only in pretensioned beams

in both post-tensioned and preten-sioned beams

none of the above

plain hot rolled wires

cold drawn wires

heat treated rolled wires

all have same tensile strength