Theory of Machine
Rectangular bar in a rectangular hole is the following type of pair

Freely constrained motion
Incompletely constrained motion
Completely constrained motion
Partially constrained motion

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

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