Theory of Machine
The Bifilar suspension method is used to determine

Moment of inertia
Position of balancing weights
Centripetal acceleration
Natural frequency of vibration

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Remain in the same place for all configurations of the mechanism
Vary with the configuration of the mechanism
None of the listed here
Moves as the mechanism moves, but joints are of permanent nature

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