RCC Structures Design
The minimum clear cover for R.C.C. columns shall be

Greater of 25 mm or diameter
Smaller of 40 mm or diameter
Smaller of 25 mm or diameter
Greater of 40 mm or diameter

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

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

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RCC Structures Design
According to load factor method, the permissible load ‘W’ on a short column reinforced with longitudinal bars and lateral stirrups, is

Stress in steel × area of steel
Stress in concrete × area of concrete + Stress in steel × area of steel
None of these
Stress in concrete × area of concrete

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