Theory of Machine
Which of the following is a turning pair?

Ball and a socket joint
Shaft with collars at both ends fitted into a circular hole
Piston and cylinder of a reciprocating steam engine
Lead screw of a lathe with nut

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Theory of Machine
Oldham's coupling is the

Second inversion of double slider crank chain
Third inversion of slider crank chain
Third inversion of double slider crank chain
Second inversion of single slider crank chain

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