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E4E10:Which of the following can create intermittent loud roaring or buzzing AC line interference?

E4E10E4E

Which of the following can create intermittent loud roaring or buzzing AC line interference?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E4E10 is All these choices are correct.

The key fact is All these choices are correct. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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