🔍 Key Concepts

• Fuel injector operation in a diesel cylinder • Relationship between injection pressure and cylinder gas pressure • Purpose of fuel spray atomization, penetration, and distribution

💭 Think About

• What must happen to the fuel spray inside the combustion chamber during injection for efficient burning? • If cylinder gas pressure is already high, why does the fuel pump have to produce even higher pressure? • Which choice describes what should normally happen in proper injection, not a fault or side-effect?

✅ Before You Answer

• Identify which options describe a normal, desired function of injection (not a problem condition). • Check which choice best matches the goals of good combustion: fine spray, correct reach, and even mixing with air. • Eliminate any options that suggest reverse flow (gas going back into the injector) or unrelated wave effects.