Theory of Machine
Bifilar suspension method is used to find the

Frequency of vibration of the body
Moment of inertia of the body
Periodic time of the body
Angular acceleration of the body

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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
The algebraic sum of the primary forces must be equal to zero
None of these
Both (A) and (B)

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