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

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

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