AERM 1203 Practice Questions and Solutions
Why are aircraft metals malleable? - Because it can be hammered, rolled, or pressed into various shapes without cracking, breaking or leaving some other detrimental effect. What does the first digit of 4130 indicate? - The basic alloying element. What are firewalls made from? - Stainless steel and or titanium. What two characteristics make aluminum skin easy to work with? - malleable and ductile What type of aluminum is 1100? - 99 % pure aluminum with one control over individual impurities. What does the first digit of 2024 aluminum indicate? - The major alloy type or element. What do designations F and O mean? - F = as fabricated O= annealed, recrystallized (wrought products only) What are two test to identify titanium? - The spark test, and the moistened metal dragged across glass making pencil like markings. How do iron constantan thermocouples function? - Electrical conductivity of a metal as it changes temperature. What quenching treatment has the slowest cooling potential? - Oil Why are parts treated in sodium and potassium nitrate baths rinsed in hot water? - Sodium and potassium nitrate are corrosive salts and need to be rinsed in water.
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