API 571 Certification (Corrosion & Materials) Practice Test

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Which material is known to ignite at ambient temperatures when interacting with low levels of ignition energy?

Carbon Steel
Aluminum
Copper Alloy
Polymeric Materials

The correct answer is: Aluminum

Aluminum is known for its reactivity, particularly in certain forms and environments. When it comes into contact with low levels of ignition energy, aluminum can ignite, especially when in powdered form or when it is finely divided. This characteristic is largely due to the high surface area-to-volume ratio in these forms, which allows for more rapid oxidation and exothermic reactions when ignited. In contrast, materials like carbon steel and copper alloys have lower reactivity and do not typically ignite under ambient conditions without significant heat or ignition sources. Polymeric materials may also be susceptible to ignition but generally require higher temperatures or specific reactive chemicals to ignite compared to aluminum. Thus, aluminum's unique properties make it the correct choice in this question regarding its ignition behavior at ambient temperatures with minimal ignition energy.