Theory of Machine
The mechanism consisting of three turning pairs and one sliding pair, is called a

Crank and slotted lever quick return motion mechanism
Single slider crank chain
Whitworth quick return motion mechanism
All of these

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Theory of Machine
Kinematic pairs are those which have

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
Elements of pairs not held together mechanically

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