Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Longest link is a fixed link
Slider is a fixed link
Coupler link is fixed
Smallest link is a fixed link

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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

Tension in the slack side of the belt
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

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