Structural Analysis
The three moments equation is applicable only when

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

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Structural Analysis
Pick up the incorrect statement from the following:

The gross section of the web of rolled I-beams is the depth of the beam multiplied by the web thickness
The gross section of the web of channels is the depth of the web multiplied by its thickness
The gross section of the web of plate girders is the depth of the web plate multiplied by its thickness
None of these

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