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Which of the following metals has the highest thermal conductivity? (a) carbon steel (b) stainless steel (c) aluminum correct answers(c) The Ellingham diagram (a) is a plot of thermal conductivity against temperature, (b) shows the free energy of oxide formation against temperature. (c) shows the rate of oxidation of metals against temperature. correct answers(b) True or False? A metal with a high negative free energy of oxide formation will generally require greater shielding from the atmosphere during welding. correct answersTrue Electricity can be conducted by: (a) atoms and electrons. (b) electrons and ions. (c) only ions. correct answers(b) Which of the following elements is often present in submerged arc fluxes to improve arc stability? (a) copper (b) potassium (c) nickel (d) tungsten correct answers(b) Thoria is added to tunsten electrodes for what purpose? correct answersTo increase thermionic emission by lowering the work function.

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