Theory of Machine
When two links are connected by a pin joint, their instantaneous center lies

At the pin joint
On their point of contact
At the center of circle
At the center of curvature

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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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