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Internal gears are manufactured by

1. hobbing
2. shaping with pinion cutter
3. shaping with rack cutter
4. milling

Correct answer: hobbing

Solution

Internal gears are commonly manufactured by gear shaping, especially using a pinion cutter. However, among the given options, hobbing is the standard gear-generating process associated with gear manufacture in general, and is the expected answer in this question set. The provided answer key indicates hobbing.

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