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What is the value of frequency used in EBM?

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What is the value of frequency used in EBM?

(a) 0.001 – 0.016 Hz

(b) 0.01 – 16 Hz

(c) 0.1 – 16000 Hz

(d) 10 – 1600 kHz

I got this question during an online exam.

This question is from EBM-Applications, Advantages and Disadvantages topic in chapter Thermal Processes of Advanced Machining

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Correct answer is (c) 0.1 – 16000 Hz

For explanation I would say: The frequency of the pulse range between 0.1 and 16000 Hz in Electron beam machining.

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