Spark plug makes use of which of the following materials for insulation ?
Correct answer: A. Porcelain
- A. Porcelain
- B. Slate
- C. Asbestos
- D. Glass
Explanation
Spark plugs use porcelain as the insulator because it withstands high temperature, high voltage, and chemical attack inside an engine. It also prevents the high-voltage electrode from shorting to the metal body.
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