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In full annealing, the metal cannot be buried in which of the following materials?(a) Sand(b) Lime(c) Ashes(d) Manganese powderI have been asked this question in an interview for job.This interesting question is from Annealing and Normalizing topic in chapter Heat treatment of Metals and Alloys of Casting-Forming-Welding II

Answer»

The correct OPTION is (d) Manganese powder

The best I can explain: In the process, full annealing, if the metal is REMOVED at high TEMPERATURES, they NEED to be BURIED. For this, the material cannot be manganese powder.



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