Theory of Machine
Bifilar suspension method is used to find the

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

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Theory of Machine
Open pairs are those which have

Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Two elements that permit relative motion

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