A diesel engine operating at a light load,...

Question 1 / 270705eccefa1bacbc34ba4d4736b

Question 1 of 270705eccefa1bacbc34ba4d4736b

A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is __________.

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Question 1 of 27070

A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is __________.

🔍 Key Concepts

• Diesel engine combustion characteristics at light versus heavy load • How excess air (air not used in combustion) changes with load • Relationship between air/fuel ratio and engine load in compression-ignition engines

💭 Think About

• Think about what happens to the amount of fuel injected into a diesel cylinder when the engine is under light load versus heavy load, while the amount of air per cycle stays nearly the same. • In which condition (light load or heavy load) will there be more unused oxygen in the cylinder after combustion? How does that affect the air/fuel ratio? • Compare this to gasoline (spark-ignition) engines: do diesels always try to keep the same air/fuel ratio, or can they vary it a lot with load?

✅ Before You Answer

• Remember that in a diesel engine, load is mainly controlled by fuel quantity, not by throttling the air like in many gasoline engines. • At light load, verify whether airflow into the cylinder changes much compared to heavy load for a given speed. • Be clear on the definition: air/fuel ratio = mass of air / mass of fuel. Decide which situation gives more air per unit of fuel.

Question 1 of 27070

A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is __________.

higher

lower

equal

directly proportional

Question 1 / 270705eccefa1bacbc34ba4d4736b

Question 1 of 270705eccefa1bacbc34ba4d4736b

A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is __________.

Back

Question 1 of 27070

A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is __________.