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

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Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

The diameter of the bar if their diameters are same
The diameter of the longer bar if their diameters are unequal
5 mm more than nominal maximum size of the coarse aggregate
Greatest value of the above

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