Theory of Machine
Length of arc of contact is given by

Arc of approach + Arc of recess
Arc of approach × Arc of recess
Arc of approach - Arc of recess
Arc of approach / Arc of recess

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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
Average tension of the tight side and slack side of the belt
Tension in the tight side of the belt
Tension in the slack side of the belt

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