🔍 Key Concepts

• Main propulsion turbine operation and common fault symptoms • How reduction gears transmit power and what kinds of failures cause noise/vibration • What each listed casualty (carryover, condenser issues, labyrinth seal failure) would MOST directly affect

💭 Think About

• For each choice, ask: would this primarily show up as a change in pressure/temperature/efficiency, or as a mechanical rumble and vibration in the turbine/gear train? • Which option most directly involves metal-to-metal contact or misalignment in high‑speed rotating machinery? • Think about where a rumbling sound would physically originate: in the steam system, the condenser, or the rotating/meshing parts of the turbine and reduction gear?

✅ Before You Answer

• Match the location of the symptom (reduction gear area) with the component most likely at fault • Distinguish between thermodynamic problems (pressure, vacuum, temperature, efficiency) and mechanical problems (noise, vibration, rumble) • Verify which listed fault is directly associated with the steam path sealing and rotor dynamics in a turbine