RCC Structures Design
Post tensioning system

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

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RCC Structures Design
In a singly reinforced beam

Elastic moduli for concrete and steel have different values within the limits of deformation of the beam
Steel possesses initial stresses when embedded in concrete
Compression is borne entirely by concrete
Plane sections transverse to the centre line of the beam before bending remain plane after bending

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