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

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

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Theory of Machine
Higher pairs are those which have

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

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