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

decrease in tensile strength but increase in ductility

increase in tensile strength but decrease in ductility

decrease in both tensile strength and ductility

increase in both tensile strength and ductility