Structural Analysis
When a series of wheel loads crosses a simply supported girder, the maximum bending moment under any given wheel load occurs when

The centre of gravity of the load system is midway between the centre of span and wheel load under consi-deration
The wheel load under consideration is midway between the centre of span and the centre of gravity of the load system
None of these
The centre of span is midway between the centre of gravity of the load system and the wheel load under consideration

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Structural Analysis
Pick up the incorrect statement from the following:

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

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