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

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

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

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