During an auto-start sequence on the marine...

Question 1 / 2066636eed28f7522a1c51de31

Question 1 of 2066636eed28f7522a1c51de31

During an auto-start sequence on the marine gas turbine control console shown in the illustration, what would be the correct order of events required to occur after the start sequence begins? Illustration GT-0016

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🔍 Key Concepts

• Gas generator (NGG) vs power turbine (PT) roles in a split‑shaft marine gas turbine • Typical automatic start sequence: spool‑up, ignition, light‑off, acceleration to idle • Relationship between ignition RPM, gas temperature rise, and reaching idle RPM

💭 Think About

• In a split‑shaft gas turbine, which rotating assembly must be turning fast enough to support combustion before fuel and ignition are introduced? • After fuel is admitted and ignition occurs, what is the first clear sign on the gauges that combustion has actually taken place? • Once stable combustion is established, which shaft will naturally accelerate to idle first during an auto‑start—gas generator or power turbine?

✅ Before You Answer

• Identify which component’s speed indicator on the illustration is labeled for GG (gas generator) and which is for PT (power turbine) • Confirm at what point in a normal start you would expect gas temperature (T5/TIT) to climb above about 400°F relative to ignition RPM and idle RPM • Verify whether idle RPM during start‑up is normally reached first by the gas generator or by the power turbine on a free‑turbine marine unit

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Question 1 of 20

NGG reaches ignition RPM, gas temperature greater than 400 degrees F, NGG reaches idle RPM.

NGG reaches idle RPM, power turbine reaches ignition RPM, gas temperature greater than 400 degrees F.

Power turbine reaches ignition RPM, gas temperature greater than 400 degrees F, power turbine reaches idle RPM.

Power turbine reaches ignition RPM, gas temperature greater than 400 degrees F, NGG reaches idle RPM.

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Question 1 / 2066636eed28f7522a1c51de31

Question 1 of 2066636eed28f7522a1c51de31

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Question 1 of 20

66636eed28f7522a1c51de31

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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