Which of the following is a turning pair?

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

Correct Answer: Shaft with collars at both ends fitted into a circular hole

When the two elements of a pair are constrained in such a way that one can only turn or revolve about a fixed axis of another link, the pair is known as turning pair.

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