🔍 Key Concepts

• Fuel oil atomization process and how clean fuel affects spray quality • How sediment or contaminants in fuel behave in small passages, nozzles, and filters • Differences between combustion problems (smoke, furnace behavior) and mechanical blockage (flow/spray issues)

💭 Think About

• Think about the path fuel takes from the tank to the burner: where would solid particles cause the most trouble? • Which of the options describes a problem that comes from restricted or partially blocked small openings rather than from air/fuel ratio issues? • Consider which symptom would show up first if hard particles are carried into the burner system.

✅ Before You Answer

• Identify which choices describe mechanical blockage or restriction versus those that describe combustion/air problems. • Ask yourself: does sediment change the fuel chemically, or does it mainly plug small openings and passages? • Focus on the component with very small holes/orifices that are most vulnerable to particles in the fuel.