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What is the thermal efficiency of a low frequency induction furnace?

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in Casting-Forming-Welding II by (119k points)
What is the thermal efficiency of a low frequency induction furnace?

(a) 60%

(b) 70%

(c) 80%

(d) 90%

I had been asked this question at a job interview.

The above asked question is from Induction Furnace in section Metal Furnace and Practice of Casting-Forming-Welding II

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Best answer
Right choice is (c) 80%

For explanation I would say: Any core type induction surface has a high amount of thermal efficiency. A low frequency induction furnace has a thermal efficiency of 80%.

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