In a diesel engine, ignition of fuel occurs due to

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Prepare for the SEPTA Bus Mechanic Test with flashcards and multiple-choice questions, each offering hints and explanations. Master every aspect of the exam!

Multiple Choice

In a diesel engine, ignition of fuel occurs due to

Explanation:
Diesel engines rely on compression ignition. The air is compressed to a very high pressure, which raises its temperature to a level that can ignite diesel fuel. When fuel is injected into this hot, compressed air, it auto-ignites without any spark or external ignition source. Glow plugs may help cold starts by warming the chamber, but they are not the primary ignition method. Spark plugs and external ignition coils are used in spark-ignition engines (like most gasoline engines), not diesels.

Diesel engines rely on compression ignition. The air is compressed to a very high pressure, which raises its temperature to a level that can ignite diesel fuel. When fuel is injected into this hot, compressed air, it auto-ignites without any spark or external ignition source. Glow plugs may help cold starts by warming the chamber, but they are not the primary ignition method. Spark plugs and external ignition coils are used in spark-ignition engines (like most gasoline engines), not diesels.

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