Structural Analysis
Castigliano’s first theorem is applicable

None of these
for statically determinate structures only
when the system behaves elastically
only when principle of superposition is valid

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

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

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