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What is the frequency of the pulse of electrons used in EBM process?

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What is the frequency of the pulse of electrons used in EBM process?

(a) 10 Hz

(b) 10^2 Hz

(c) 10^3 Hz

(d) 10^4 Hz

I had been asked this question in a national level competition.

Enquiry is from Electronbeam Machining-Introduction, Equipment and Material removal in division Thermal Processes of Advanced Machining

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Best answer
Right choice is (d) 10^4 Hz

Easiest explanation: A pulsed electron beam at 10^4 Hz reduces the temperature of the work piece outside the region being machined.

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