🔍 Key Concepts

• fuel injector nozzle design and why multi-orifice (multi-hole) nozzles are used • how fuel must be distributed and atomized inside a diesel cylinder • relationship between spray pattern and the shape/volume of the combustion space

💭 Think About

• Ask yourself: what engine feature actually determines where the fuel needs to go and how it must spread inside the cylinder? • Which of the options would most strongly affect the spray pattern, angle, and penetration of the injected fuel? • Which choice is about the geometry of where combustion takes place, rather than about a single part or setting in the fuel system?

✅ Before You Answer

• Identify which option deals with the shape and arrangement of the space where fuel and air mix and burn. • Eliminate any options that are only about individual components (like a spring or rings) and do not control the spray pattern inside the cylinder. • Think: the number and placement of nozzle holes must match the required fuel spray pattern inside the combustion space, not just the pressure or a single hardware dimension.