Theory of Machine
The relation between number of links (l) and number of joints (j) in a kinematic chain is

l = (1/2).(j + 2)
l = (2/3).(j + 2)
l = (3/4).(j + 3)
l = j + 4

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Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

The algebraic sum of the primary forces must be equal to zero
Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
None of these

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