🔍 Key Concepts

• Purpose of a strainer in a fuel oil system • Difference between solid particles, water, and dissolved contaminants in fuel • How fuel is prepared before it reaches the burner or atomizer

💭 Think About

• Think about what a wire mesh or perforated basket-type device physically stops from passing through it. • Which of these options describes something that can be caught on or retained by a screen, rather than needing chemical absorption or heating? • In a boiler fuel system, what type of impurity would most directly damage or clog burners and small passages?

✅ Before You Answer

• Identify which choice refers specifically to particles that can be trapped on a screen. • Eliminate any option that would require chemical action or temperature change, not just a physical barrier. • Ask yourself: which function is most commonly associated with the word strainer in piping systems?