Theory of Machine
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Lower pair
Higher pair
Self-closed pair
Force-closed pair

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

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