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 compression
Always be tension
Change from compression to tension

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Structural Analysis
To generate the j th column of the flexibility matrix

a unit displacement is applied at co-ordinate j and the displacements are calculated at all co-ordinates
a unit force is applied at coordinate j and the displacements are calculated at all coordinates
a unit force is applied at coordinate j and the forces are calculated at all coordinates
a unit displacement is applied at co-ordinate j and the forces are calculated at all coordinates

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Structural Analysis
The effective and actual lengths of a cantilever are same if continuous at the support,

Restrained against torsion at the support and free at the end
None of these
Unstrained against torsion at the support and free at the end
With partial restraint against torsion of the support and free at the end

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