Machine Design
For low and moderate speed engines, the cam follower should move with

Cycloidal motion
Simple harmonic motion
Uniform acceleration and retardation
Uniform velocity

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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
The angle between the tangent to the pitch helix and the plane of rotation
Half the angle between two inclined faces in axial plane

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