You are asked by the watch or duty engineer to check for any evidence for turbocharger surging. What should you check for?

Correct Answer: Option A — By listening for cyclic changes in turbocharger sound pitch.

Turbocharger surging produces distinct, audible fluctuations in operating pitch and frequency caused by flow reversals across the compressor blades. Operators identify this aerodynamic instability immediately through characteristic cyclic acoustic changes.