Machine Design
The cam follower extensively used in aircraft engines is

Roller follower
Spherical faced follower
Flat faced follower
Knife edge follower

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and an element of the cylinder
None of these
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and the plane of rotation

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