🔍 Key Concepts

• Diesel engine combustion process (from compression to ignition) • Functions of the fuel injection system: timing, metering, atomization, and penetration • Difference between an injection setting/geometry and a general combustion characteristic

💭 Think About

• For each option, ask: Is this something directly adjusted or designed into the injection equipment (pump/nozzle), or is it a broader combustion event in the cylinder? • Think about which terms are typically used when discussing injector nozzle spray characteristics versus cam and pump settings. • Consider which of these you would still talk about when analyzing combustion in a running engine, even if the specific injector design is unknown.

✅ Before You Answer

• Identify which terms are clearly tied to nozzle spray behavior (how the fuel comes out of the injector). • Identify which term is clearly tied to pump/cam motion (mechanical drive of the injector). • Then see which remaining term best fits a combustion parameter that exists in diesel operation but is not itself an injection-system function.