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What is the radius of channel, when electrical breakdown occur?

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in Advanced Machining by (962k points)
What is the radius of channel, when electrical breakdown occur?

(a) 4 µm

(b) 6 µm

(c) 8 µm

(d) 10 µm

I have been asked this question in an interview for job.

My question is from EDM-Mechanism of Material Removal in portion Thermal Processes of Advanced Machining

1 Answer

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Best answer
Correct answer is (d) 10 µm

The explanation: In EDM, the electrical breakdown occurs in dielectric in a channel of radius about 10 µm.

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