Theory of Machine
In order to balance the reciprocating masses,

Secondary forces and couples must be balanced
Both (A) and (B)
None of these
Primary forces and couples must be balanced

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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
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
Mass of cam follower linkage, spring stiffness and cam speed

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