Machine Design
In cyclic loading, stress concentration is more serious in

Elastic materials
Brittle as well as ductile materials
Brittle materials
Ductile materials

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Machine Design
In worm, gears, pitch lead angle is

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

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