Theory of Machine
The cam follower generally used in aircraft engines is

Roller follower
Knife edge follower
Flat faced follower
Spherical faced follower

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

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

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