🔍 Key Concepts

• Fuel atomization in diesel engines and how droplet size affects burning • Relationship between injection system settings (pressure, nozzle design) and actual cylinder processes • What process inside the cylinder is most directly influenced by how finely the fuel is broken up

💭 Think About

• Ask yourself: If the fuel droplets become much finer or much coarser, what changes first and most inside the cylinder? • Which option describes something that is primarily set by nozzle design and cam timing, rather than by how well the fuel is broken up? • Which option deals with the end result of how fuel and air actually mix and burn, rather than just how they are introduced?

✅ Before You Answer

• Identify which choice is about the final burning process versus those about mechanical/injection characteristics • Consider which factor is most sensitive to droplet size and fuel–air mixing quality • Eliminate any options that are mostly fixed by engine design (geometry, timing, nozzle hole arrangement) rather than by a change in atomization quality