The use of a lower grade of fuel than designed for the engine can lead to ?

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Multiple Choice

The use of a lower grade of fuel than designed for the engine can lead to ?

Explanation:
Lower grade fuel has a lower octane rating, which means it is less resistant to detonation. In a high-compression engine, the air–fuel mixture can ignite prematurely or violently as the piston compresses the charge, producing detonation (knock). This rapid, uncontrolled pressure rise disrupts smooth combustion, reduces power, and can stress or damage engine components. That’s why using a fuel of insufficient grade leads to detonation.

Lower grade fuel has a lower octane rating, which means it is less resistant to detonation. In a high-compression engine, the air–fuel mixture can ignite prematurely or violently as the piston compresses the charge, producing detonation (knock). This rapid, uncontrolled pressure rise disrupts smooth combustion, reduces power, and can stress or damage engine components. That’s why using a fuel of insufficient grade leads to detonation.

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