Theory of Machine
Bifilar suspension method is used to find the

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

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Theory of Machine
In a hydrodynamic journal bearing, there is

No lubricant between the journal and the bearing
A thick film of lubricant between the journal and the bearing
A forced lubricant between the journal and the bearing
A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing

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