🔍 Key Concepts

• Gas turbine fuel quality and why contaminants are tightly controlled • How calcium behaves at high temperature (think about deposits vs. corrosion vs. abrasion) • Which turbine sections actually see the fuel combustion products and where small holes or passages are critical

💭 Think About

• Ask yourself: when calcium comes from fuel ash, does it act more like a soft scale/deposit, a hard abrasive, or a corrosive chemical at turbine temperatures? • Which part of a gas turbine is most vulnerable to being blocked by solid deposits carried in hot combustion gases? • Consider the path: fuel → combustion → hot gases flow through turbine. Which components and tiny passages are directly washed by these hot gases?

✅ Before You Answer

• Identify which options deal with deposit/scale formation versus abrasion versus corrosion versus filter clogging. • Think about which turbine section has very small cooling holes or passages that, if blocked, would overheat metal parts. • Remember that fuel-borne metals like calcium usually end up as ash in the hot gas path, not as particles in the compressor inlet air.