Structural Analysis
The three moments equation is applicable only when

The spans are equal
There is no discontinuity such as hinges within the span
The beam is prismatic
There is no settlement of supports

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

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