Concrete Technology and Design of Concrete Structures
Select the incorrect statement...

The loss of prestress is more in pre-tensioning system than in post-tensioning system.
None of these
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

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Concrete Technology and Design of Concrete Structures
If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
depends on as, only
depends on aCbC only
depends on both crst and acbc

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

both forces of tension and compres-sion as well as lever arm remain unchanged
both forces of tension and compres-sion as well as lever arm change
forces of tension and compressions remain unchanged but lever arm changes with the moment
forces of tension and compression change but lever arm remains unchanged

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