Fuels: auto-ignition (self-ignition) temperature comparison The self-ignition temperature of petrol (gasoline) compared with diesel oil is: Choose the correct option.
Mechanical Engineering
IC Engines and Nuclear Power Plants
Difficulty: Easy
Choose an option
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AHigher
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BLower
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CAbout the same
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DNot comparable
Answer
Correct Answer: Higher
Explanation
ConceptAuto-ignition temperature (AIT) is the minimum temperature required for a fuel–air mixture to ignite without an external spark. Typical AIT: diesel ≈ 210°C (lower), petrol ≈ 280–450°C (higher, depending on blend).
ImplicationBecause petrol has a higher AIT, it is used in SI engines; diesel's lower AIT enables compression ignition.
Final AnswerHigher