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

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

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

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
Single I-beam or channels back with or without flange plates may be used
All of these

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