On a gas turbine powered vessel equipped...

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Question 1 of 205eccef9fbacbc34ba4d46b4f

On a gas turbine powered vessel equipped with a synchro-self-shifting (SSS) clutch, you are preparing for a power turbine overspeed test. What would be an important action to take prior to starting the engine?

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🔍 Key Concepts

• SSS (synchro-self-shifting) clutch basic operating principle • What happens to a free‑running power turbine during an overspeed test • Whether the SSS clutch should be engaged or prevented from engaging during overspeed testing

💭 Think About

• Ask yourself: during a power turbine overspeed test, do you want the turbine driving the shaft and gear train, or do you want it isolated? Why? • Think about what could be damaged if the clutch were to engage unexpectedly while the turbine is being driven toward overspeed. • Consider which option corresponds to a positive mechanical means of preventing engagement, rather than relying on normal operation.

✅ Before You Answer

• Verify which choice provides a deliberate lock-out of the SSS clutch, not just normal engagement or calculation. • Eliminate any option that would tend to connect the turbine to the reduction gear during an overspeed test. • Check that the remaining option matches standard safety precautions for overspeed testing gas turbine power turbines.

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