Theory of Machine
Longitudinal vibrations are said to occur when the particles of a body moves

Perpendicular to its axis
None of these
In a circle about its axis
Parallel to its axis

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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
Both (A) and (B)
None of these

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