🔍 Key Concepts

• fuel oil viscosity and temperature relationship • how fuel atomization at the burner affects combustion and smoke color • typical causes of black smoke vs. white smoke from boilers

💭 Think About

• Think about what happens to fuel viscosity when temperature drops and how that changes spray quality at the burner nozzle. • Consider which smoke color is usually linked to unburned carbon (soot) versus unvaporized droplets or moisture. • Ask yourself: does low fuel temperature more likely affect suction at the pump, strainer clogging, or the way the fuel burns at the burner tip?

✅ Before You Answer

• Verify how low temperature increases viscosity and its effect on fuel atomization and combustion efficiency. • Recall which smoke color is commonly associated with sooty, incomplete combustion versus vapor or water-related issues. • Eliminate choices that deal with pump suction or strainer clogging if they are not the most direct effect of slightly low fuel temperature at the burner.