Question:
Spark plugs are made up of
Spark plugs are made up of
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Alumina is used in spark plugs because it has high electrical insulation and high thermal stability.
Updated On: May 7, 2026
- Alumina
- Bone china
- Cordierite
- Soft Porcelain
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The Correct Option is A
Solution and Explanation
Concept:
Spark plugs require a ceramic material that can work at high temperature, has high electrical insulation, good mechanical strength, and good thermal shock resistance.
Step 1: A spark plug is used in an internal combustion engine.
Step 2: The ceramic part of the spark plug acts as an electrical insulator.
Step 3: This insulator must withstand high temperature and high voltage without electrical breakdown.
Step 4: Alumina \((Al_2O_3)\) has:
• high dielectric strength,
• high thermal stability,
• good mechanical strength,
• good corrosion resistance.
Step 5: Because of these properties, alumina is widely used in spark plug insulators. Therefore, spark plugs are made up of: \[ \boxed{\text{Alumina}} \]
Step 1: A spark plug is used in an internal combustion engine.
Step 2: The ceramic part of the spark plug acts as an electrical insulator.
Step 3: This insulator must withstand high temperature and high voltage without electrical breakdown.
Step 4: Alumina \((Al_2O_3)\) has:
• high dielectric strength,
• high thermal stability,
• good mechanical strength,
• good corrosion resistance.
Step 5: Because of these properties, alumina is widely used in spark plug insulators. Therefore, spark plugs are made up of: \[ \boxed{\text{Alumina}} \]
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