Engineering · Diesel — Combustion
Ignition in a diesel engine is initiated by:
- AA spark plug timed to the compression stroke
- BThe heat of air compressed to a high temperature✓ Correct
- CA glow plug that fires on every stroke
- DPre-heated fuel injected during intake
Explanation
Diesels are compression-ignition engines: air is compressed to roughly 500-600 C, and fuel injected near top dead center ignites from that heat without a spark.
Authority: Diesel Engines (USCG engineering topic)
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