🔍 Key Concepts

• Fuel oil viscosity and how temperature affects it • What atomization means in fuel burners • Difference between heating value of fuel and how it is burned

💭 Think About

• Think about what happens to thick, heavy fuel oil when it is cold and has to pass through small burner nozzles. • Which option describes something that improves the spray pattern of the fuel as it enters the furnace or boiler? • Does heating the fuel actually change its energy content, or mainly how easily it can be pumped and sprayed?

✅ Before You Answer

• Identify which choice relates to spray/particle size rather than energy content or ignition point. • Ask: does heating normally lower or raise ignition temperature? Compare that to the wording of the options. • Consider whether normal preheating temperatures are high enough to boil water out of the fuel, or mainly to reduce viscosity for proper burner operation.