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Emission current depends up on which of the following factors?

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Emission current depends up on which of the following factors?

(a) Cathode material

(b) Temperature

(c) Voltage supply

(d) All of the mentioned

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

I need to ask this question from Electronbeam Machining-Introduction, Equipment and Material removal topic in division Thermal Processes of Advanced Machining

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The correct choice is (d) All of the mentioned

The best explanation: Emission current depends on the cathode material, temperature, and the high voltage in the process of Electron beam machining.

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