🔍 Key Concepts

• Behavior of asphaltenes in residual (heavy) fuel when mixed with distillate fuel • Effect of fuel compatibility/incompatibility during changeover between heavy fuel oil and marine gas oil • Typical causes of progressively shorter filter-clogging intervals in fuel treatment systems

💭 Think About

• Think about what happens inside the fuel system when a heavy residual fuel is gradually diluted with a lighter distillate fuel—does this make certain components more likely to stay dissolved, or to drop out as solids? • Which option deals specifically with a change in fuel chemistry between two different fuels, rather than with engine combustion or tank layering? • If the filters are clogging faster and faster over time during the changeover, what process could be creating more and more fine particles that collect on the filters?

✅ Before You Answer

• Identify which choices are related to fuel chemistry in the mixing/blending process rather than to engine cylinder lubrication or combustion products. • Consider which phenomenon would most likely produce solid particles or sludge that would accumulate in the final filters. • Ask yourself which option is commonly associated with changeover problems between residual and distillate fuels in real engine-room practice.