Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Cheapest method
Has no effect as regards fatigue strength
Best method
Extremely hazardous

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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
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

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