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

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
Ball and a socket joint

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Theory of Machine
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

Total lift, centre of gravity of the cam and cam speed
Mass of cam follower linkage, spring stiffness and cam speed
Radius of circular arc, cam speed, location of centre of circular arc and roller diameter
Total lift, total angle of lift, minimum radius of cam and cam speed

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