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Machining speeds have gone up to how many times after the invention of EDM?

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Machining speeds have gone up to how many times after the invention of EDM?

(a) Ten

(b) Twenty

(c) Thirty

(d) Fifty

I have been asked this question in final exam.

I need to ask this question from Electro Discharge Machining-Introduction topic in section Thermal Processes of Advanced Machining

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Right choice is (b) Twenty

The explanation: Machining speeds have gone up to 20 times after the invention of EDM.

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