🔍 Key Concepts

• Fuel oil viscosity and temperature relationship in burners • Effect of overheating fuel on burner performance and spray pattern • Difference between burner issues vs. pumping/straining problems

💭 Think About

• Which option directly relates to how fuel behaves when it is heated too much, especially at the burner nozzle? • Which problems are more likely caused by contamination, sludge, or mechanical restrictions rather than temperature alone? • Think about what happens to viscosity and spray fineness as temperature increases beyond the recommended range.

✅ Before You Answer

• Check what high temperature does to viscosity and how that affects the spray at the atomizer tip. • Decide which choices are more about flow restriction or blockage (often caused by dirt/contaminants, not temperature). • Consider normal purpose of fuel oil heaters: they are used to reach an optimum temperature for proper atomization—what if you go beyond that?