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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Machine Design
Pitch point of a cam is

A point on the pitch curve having minimum pressure angle
Any point on the pitch circle
Any point on the pitch curve
A point on the pitch curve having maximum pressure angle

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