RCC Structures Design
Post tensioning system

Is economical for large spans and is adopted now a days
Was widely used in earlier days
None of these
Is not economical and hence not generally used

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RCC Structures Design
A pre-stressed concrete member is preferred because

Large size of long beams carrying large shear force need not be adopted
All listed here
Removal of cracks in the members due to shrinkage
Its dimensions are not decided from the diagonal tensile stress

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