Theory of Machine
The example of spherical pair is

Ball bearing and roller bearing
Bolt and nut
Ball and socket joint
Lead screw of a lathe

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

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

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