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After invention of EDM, surface finish have improved by how much factor?

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After invention of EDM, surface finish have improved by how much factor?

(a) 10

(b) 15

(c) 20

(d) 25

I have been asked this question in homework.

I'd like to ask this question from Electro Discharge Machining-Introduction in division Thermal Processes of Advanced Machining

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Best answer
Correct choice is (b) 15

For explanation: Surface finish have been improved by a factor of 15 after the invention of EDM.

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