Theory of Machine
Bifilar suspension method is used to find the

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

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Theory of Machine
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Sum of the tensions on the tight side and slack side of the belt
Tension in the tight side of the belt
Average tension of the tight side and slack side of the belt
Tension in the slack side of the belt

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