Structural Analysis
When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that

the tail of the load reaches the section
the head of the load reaches the section
the load position should be such that the section divides the load in the same ratio as it divides the span
the load position should be such that the section divides it equally on both sides

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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
Greatest value of the above
5 mm more than nominal maximum size of the coarse aggregate

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