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

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

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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

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
Radius of circular arc, cam speed, location of centre of circular arc and roller diameter

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