Theory of Machine
Whitworth quick return mechanism is obtained by inversion of

Slider crank mechanism
Kinematic chain
Roller cam mechanism
Five link mechanism

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Theory of Machine
Lower pairs are those which have

Elements of pairs not held together mechanically
Surface contact between the two elements when in motion
Two elements that permit relative motion
Point or line contact between the two elements when in motion

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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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