Structural Analysis
A pin-jointed plane frame is unstable if (where m is number of members, r is reaction components and j is number of joints)

(m + r)>2j
None of these
(m + r)<2j
m + r = 2j

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

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