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

The diameter of the longer bar if their diameters are unequal
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

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Structural Analysis
The effective length of lacing is the distance

Between the inner ends of effective lengths of welds connecting the members
All of these
Between the inner end rivets of the bar for single lacing
0.7 of the distance between the inner end rivets of the bar for double lacing

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

All of these
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

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