Machine Design
Stress concentration is caused due to

Abrupt change of section
Pitting at points or areas at which loads on a member are applied
All of these
Variation in properties of material from point to point in a member

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Machine Design
The face of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the top of the tooth
Surface of the tooth above the pitch surface

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