Machine Design
The value of Lewis form factor used in design of gears is

Dependent on system of teeth
Independent of size of teeth
All of these
Dependent on number of teeth of a gear

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

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