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

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

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