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
Lead screw of a lathe with nut
Piston and cylinder of a reciprocating steam engine

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Theory of Machine
Which of the following statement is correct for involute gears?

A convex flank is always in contact with concave flank.
The variation in centre distance of shafts increases radial force.
The interference is inherently absent.
The pressure angle is constant throughout the teeth engagement.

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