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It is desired to avoid interference in a pair of spur gears having a 20° pressure angle. With increase in pinion to gear speed ratio, the minimum number of teeth on the pinion

1. increases
2. decreases
3. first increases and then decreases
4. remains unchanged

Correct answer: increases

Solution

As the speed ratio between the pinion and gear increases, the pinion must have more teeth to maintain proper engagement and avoid interference, especially with a 20° pressure angle, which requires a minimum number of teeth to ensure smooth operation.

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