Theory of Machine
The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as

Incompletely constrained motion
Successfully constrained motion
Completely constrained motion
None of these

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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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