1. Which of the following metals has the highest thermal conductivity?
(a) carbon steel
(b) stainless steel
(c) aluminum
Answer: (c)
2. 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.
Answer: (b)
3. True or False?
A metal with a high negative free energy of oxide formation will generallyrequire greater
shielding from the atmosphere during welding.
Answer: True
4. Electricity can be conducted by:
(a) atoms and electrons.
(b) electrons and ions.
(c) only ions.
Answer: (b)
5. Which of the following elements is often present in submerged arc fluxesto improve arc
stability?
(a) copper
(b) potassium
(c) nickel
(d) tungsten
Answer: (b)
6. Thoria is added to tunsten electrodes for what purpose?
Answer: To increasethermionic emission by lowering the work function.
7. True or False?
All pure metals have the same crystal structure.
Answer: False. Metals generally haveone of three basic structures.
8. Which crystal structure(s) is (are) composed of close-packed planes?
Answer: FCCand HCP
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