Spark plugs are made of______________________?
Correct answer: A. High alumina ceramic
- A. High alumina ceramic
- B. Metallic carbides
- C. Corundum
- D. Carborundum
Explanation
Spark plugs use high-alumina ceramic as the electrical insulator because it withstands high temperature, thermal shock, and electrical breakdown. Corundum is crystalline alumina, but the engineering material specified for the component is high-alumina ceramic.
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