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

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

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Two lower pairs and two additional links
One lower pair and two additional links
Any one of these
Two lower pairs and one additional link

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