Structural Analysis
Castigliano’s first theorem is applicable

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

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Structural Analysis
The effective and actual lengths of a cantilever are same if continuous at the support,

With partial restraint against torsion of the support and free at the end
Unstrained against torsion at the support and free at the end
Restrained against torsion at the support and free at the end
None of these

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