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What is differential freezing?(a) Increase in oxygen concentration(b) Increase in nitrogen concentration(c) Increase in carbon concentration(d) Increase in hydrogen concentrationThe question was asked in an internship interview.Question is from Mold-Metal Reaction in section Mold and Mold Making of Casting-Forming-Welding I

Answer» RIGHT choice is (d) INCREASE in hydrogen concentration

The BEST explanation: When there is an increase in the hydrogen concentration of the METALMOLD reaction, then that phenomena is called differential freezing.


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