An unusual vibration in the main propulsion...

Question 1 / 270705eccefa0bacbc34ba4d46f6c

Question 1 of 270705eccefa0bacbc34ba4d46f6c

An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by __________.

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Question 1 of 27070

An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by __________.

🔍 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

Question 1 of 27070

An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by __________.

a carryover from the boiler

a reduction in condenser vacuum

overloading of the condenser

a labyrinth seal failure

Question 1 / 270705eccefa0bacbc34ba4d46f6c

Question 1 of 270705eccefa0bacbc34ba4d46f6c

An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by __________.

Back

Question 1 of 27070

An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by __________.