Concrete Technology and Design of Concrete Structures
Examine the following statements :
i) Factor of safety for steel should be based on its yield stress,
ii) Factor of safety for steel should be based on its ultimate stress,
iii) Factor of safety for concrete should be based on its yield stress,
iv) Factor of safety for concrete should be based on its ultimate stress.
The correct statements are

(ii) and (iv)
(ii) and (iii)
(i) and (iv)
(i) and (iii)

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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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