What are the two prime sources of deposits that build up on compressor blades?

Correct Answer: Option D — Lube oil mist and salt spray

Compressor fouling is primarily caused by salt spray from the marine environment and lube oil mist leaking from bearing seals. These contaminants adhere to the compressor blades, disrupting aerodynamic profiles, reducing mass flow, and lowering compressor efficiency, which necessitates regular water washing to maintain optimal gas turbine performance.