Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

The diameter of the bar if their diameters are same
The diameter of the longer bar if their diameters are unequal
Greatest value of the above
5 mm more than nominal maximum size of the coarse aggregate

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Structural Analysis
Pick up the correct statement applicable to cased columns.

All of these
Single I-beam or channels back with or without flange plates may be used
The surface and edges of the steel column should be provided a concrete cover not less than 50 mm
Single I-beam or channels back with or without flange plates may be used

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