Theory of Machine
Inertia force acts

Along the direction of acceleration force
Opposite to the direction of acceleration force
Perpendicular to the acceleration force
None of the listed here

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

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