Machine Design
Stress concentration is caused due to

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

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

The new belt will carry more than its share and result in short life
New and old belts will cause vibrations
Only one belt cannot be fitted with other used belts
Belts are available in sets

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