The turbochargers on the main propulsion...

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Question 1 of 2066636eef28f7522a1c5203f1

The turbochargers on the main propulsion engines on the fishing factory ship to which you are assigned are fitted with an exhaust inlet screen to protect the turbocharger turbine. Upon inspection, pieces of broken piston rings or exhaust valves are found in the foreign object trap box. Why is it essential that this debris be removed prior to placing the engine back into operation?

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Question 1 of 20

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🔍 Key Concepts

• Function and purpose of a turbocharger foreign object trap box and exhaust inlet screen • How metallic debris interacts with high-speed rotating turbine blades • Consequences of debris size and shape changing over time in a high-temperature, high-velocity gas stream

💭 Think About

• Think about what can happen if pieces of metal are allowed to stay near a high-speed turbine wheel, even if they are currently trapped. • Consider whether the main risk is about difficulty of cleaning, restriction of gas flow, damage from impact, or balance of the entire casing. • Ask yourself: if these parts break down or shift position while the engine is running, what is the most serious engineering consequence?

✅ Before You Answer

• Identify which choice deals directly with turbine foreign object damage (FOD) and impact on the rotating wheel itself. • Separate minor maintenance inconveniences from critical engine safety and damage risks. • Verify which option describes a realistic failure mode in which the debris could move from the trap/screen area into contact with the turbine blades.

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