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The non-traditional machining process that essentially requires a vacuum is

1. electron beam machining
2. electro chemical machining
3. electro chemical discharge machining
4. electro discharge machining

Correct answer: electron beam machining

Solution

Electron beam machining uses a high-velocity electron beam, which would get scattered in air. Therefore, it is performed in a vacuum chamber. The other listed processes do not essentially require vacuum.

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