Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Decreases
Increases
None of these
Remains unchanged

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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

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

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