Theory of Machine
Bifilar suspension method is used to find the

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

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Theory of Machine
In gears, interference takes place when

Pitch of the gears is not same
The tip of a tooth of a mating gear digs into the portion between base and root circles
Gear teeth are undercut
Gears do not move smoothly in the absence of lubrication

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