Question:
\(\ldots\ldots\ldots\ldots\ldots\) is used as sparkplug of Automobiles
\(\ldots\ldots\ldots\ldots\ldots\) is used as sparkplug of Automobiles
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Alumina is used in spark plug insulators because it has high electrical insulation and high temperature resistance.
Updated On: May 7, 2026
- Silicon carbide
- Alumina
- Zirconia
- Magnesia
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The Correct Option is B
Solution and Explanation
Spark plugs in automobiles require a ceramic insulator.
The ceramic material used must have high electrical insulation, high temperature resistance, good mechanical strength, and thermal shock resistance.
Alumina:
\[
Al_2O_3
\]
is widely used for spark plug insulators.
It has high dielectric strength and can withstand high engine temperatures.
It also resists chemical attack and mechanical damage.
Silicon carbide is more conductive and is not suitable as a spark plug insulator.
Zirconia and magnesia have special ceramic applications, but alumina is the common material used for automobile spark plugs.
Therefore, the correct answer is:
\[
\text{Alumina}.
\]
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