Machine Design
In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

3.5d
d + 17 mm
2d + 13 mm
2d + 20 mm

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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
Only one belt cannot be fitted with other used belts
New and old belts will cause vibrations
Belts are available in sets

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