Structural Analysis
Muller Breslau’s principle for obtaining influence lines is applicable to i) trusses ii) statically determinate beams and frames iii) statically indeterminate structures, the material of which is elastic and follows Hooke’s law iv) any statically indeterminate structure The correct answer is

only (i)
(i), (ii) and (iii)
(i), (ii) and (iv)
(i) and (ii)

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

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 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 displacement is applied at co-ordinate j and the forces are calculated at all coordinates

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