Structural Analysis
For heavily reinforced concrete member, the nominal maximum size of the aggregates should be restricted to

5 mm less than the minimum clear distance between the main bars
5 mm less than the minimum cover to the reinforcement
Smaller of A and B
Greater of A and B

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

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