In all diesel engines, including those used...

Question 1 / 2707066636eef28f7522a1c51f985

Question 1 of 2707066636eef28f7522a1c51f985

In all diesel engines, including those used in offshore oil spill response vessels, at what point in the combustion cycle does ignition actually begin?

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Question 1 of 27070

In all diesel engines, including those used in offshore oil spill response vessels, at what point in the combustion cycle does ignition actually begin?

🔍 Key Concepts

• Compression-ignition principle in diesel engines (fuel ignites from heat of compressed air, not from a spark plug) • Sequence of four-stroke cycle events: intake, compression, power (expansion), exhaust / scavenging • Relationship between fuel injection timing and when temperature and pressure are highest in the cylinder

💭 Think About

• In a diesel, when is the air in the cylinder hot enough from compression alone to ignite injected fuel? Think about where this occurs in the stroke. • Which event must be almost finished so that pressure and temperature are at or near their maximum, just before the piston starts back down? • Compare each choice with the basic order of strokes: intake (or scavenging), compression, power (expansion), and exhaust. Which one lines up with when diesel fuel is injected and self‑ignites?

✅ Before You Answer

• Be sure you know the correct order of the four strokes in a typical diesel cycle. • Identify during which stroke fuel is injected in a diesel engine. • Verify that ignition can only occur when temperature and pressure from compression are high enough—match that condition to the correct point in the listed events.

Question 1 of 27070

In all diesel engines, including those used in offshore oil spill response vessels, at what point in the combustion cycle does ignition actually begin?

Near the completion of the expansion (power) event

At the beginning of the compression event

Near the completion of the compression event

Near the completion of the scavenging event

Question 1 / 2707066636eef28f7522a1c51f985

Question 1 of 2707066636eef28f7522a1c51f985

In all diesel engines, including those used in offshore oil spill response vessels, at what point in the combustion cycle does ignition actually begin?

Back

Question 1 of 27070

In all diesel engines, including those used in offshore oil spill response vessels, at what point in the combustion cycle does ignition actually begin?