🔍 Key Concepts

• Diesel fuel injection system functions (what the injector actually controls) • The meaning of atomization, metering, and penetration in fuel injection • The basic purpose of scavenging in two-stroke or four-stroke engines

💭 Think About

• Which of these terms is directly about how fuel is delivered through the injector (quantity, droplet size, spray reach)? • Which option describes a process involving air movement and exhaust gas removal, rather than the fuel spray itself? • If you grouped three of these as "spray characteristics" of injected fuel, which one would be left out of that group?

✅ Before You Answer

• Identify which terms are fuel spray characteristics controlled by injection system design • Identify the term that mainly deals with cylinder gas exchange (fresh air in, exhaust out) instead of fuel behavior • Be sure you can briefly define each term in your own words before choosing an answer