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

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

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Structural Analysis
The effective length of lacing is the distance

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

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