Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

Same
More or less depending on quantum of load
More
Less

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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

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

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