In the heating process of ______ type a simple method of temperature control is possible by means of a ...

In the heating process of ______ type a simple method of temperature control is possible by means of a special alloy which loses its magnetic properties at a particular high temperature and regains them when cooled to a temperature below this value. (A) Indirect induction oven (B) core type induction furnace (C) coreless induction furnace (D) high frequency eddy current
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In the heating process of high frequency eddy current type a simple method of temperature control is possible by means of a special alloy which loses its magnetic properties at a particular high temperature and regains them when cooled to a temperature below this value. 

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