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MMLU / Low frequency supply is necessary for direct core type induction furnaces…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Low frequency supply is necessary for direct core type induction furnaces because

choices

  1. With normal frequeny supply the electromagnetic forces causes severe stirring action in the molten metal.
  2. Magnetic coupling between the primary and secondary circuit is poor.
  3. Both A and B.
  4. None of the above.

subject

electrical_engineering

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