Fuel additives: inhibitor of pre-ignition/knock in spark-ignition engines Identify the effective inhibitor historically used to suppress pre-ignition/knock. Choose the correct option.
Mechanical Engineering
IC Engines and Nuclear Power Plants
Difficulty: Easy
Choose an option
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AAlcohol
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BWater
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CLead
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DNone of these
Answer
Correct Answer: Lead
Explanation
ConceptTetraethyl lead (TEL) was historically used to raise octane number and reduce knock/pre-ignition in petrol engines by slowing end-gas reactions. (Modern fuels use unleaded additives due to environmental regulations.)
NotesAlcohol/water injection can reduce charge temperature and suppress knock in specific setups but TEL was the classic chemical inhibitor.
Final AnswerLead