Structural Analysis
When a load crosses a through type Pratt truss in the direction left to right, the nature of force in any diagonal member in the left half of the span would

Always be tension
Always be compression
Change from compression to tension
Change from tension to compression

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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 tail of the load reaches the section
the load position should be such that the section divides it equally on both sides
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

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

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