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

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Structural Analysis
The effective length of lacing is the distance

0.7 of the distance between the inner end rivets of the bar for double lacing
Between the inner end rivets of the bar for single lacing
All of these
Between the inner ends of effective lengths of welds connecting the members

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

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
The diameter of the bar if their diameters are same

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