RCC Structures Design
The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon

All of the listed here
Centre to centre distance between T-beams
Overall thickness of the rib
Breadth of the rib

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RCC Structures Design
Pick up the assumption for the design of a pre-stressed concrete member from the following:

During deformation limits, Hook's law is equally applicable to concrete as well as to steel
A transverse plane section remains a plane after bending
Variation of stress in reinforcement due to changes in external loading is negligible
All listed here

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