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
In a four bar chain or quadric cycle chain

One is a turning pair and three are sliding pairs
Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair
Two are turning pairs and two are sliding pairs

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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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