Machine Design
Lewis equation in gears is used to find the

Shear stress
Tensile stress in bending
Fatigue stress
Compressive stress in bending

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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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