Theory of Machine
A body is said to be under forced vibrations, when

A body vibrates under the influence of external force
None of these
No external force acts on a body, after giving it an initial displacement
There is a reduction in amplitude after every cycle of vibration

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Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

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
The algebraic sum of the primary forces must be equal to zero
None of these

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