The main propulsion engines onboard your...

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Question 1 of 2066636eef28f7522a1c51fed4

The main propulsion engines onboard your fishery research vessel use a lubricating oil system as shown in the illustration. Under what circumstances will the turbo soak-back pump operate? Illustration MO-0186

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🔍 Key Concepts

• Turbocharger lubrication requirements during start-up and shutdown • Purpose of a soak-back (after-running) pump in a lube oil system • Clues in the diagram: oil flow path through the turbo soak-back pump, check valves, and any timing/pressure controls

💭 Think About

• Look at the turbocharger bearings on the right side of the diagram and trace the lube oil path both when the main lube oil pump is running and when it is stopped. In which condition would the turbo still be spinning but the main engine lube supply might not be available? • Ask yourself why a separate small pump and filter are provided just for ‘turbo soak back’ instead of using the main lube oil pump alone. • Compare the answer choices: which options protect the turbo bearings from oil starvation caused by high speed rotation with no main oil flow?

✅ Before You Answer

• Verify what component supplies oil to the turbocharger during normal engine operation – is it the main lube oil system or the turbo soak-back pump? • Identify what prevents backflow in the turbo lube line (such as a check valve) and think about when that would open or close. • Confirm whether the soak-back pump would be needed before start, after shutdown, or continuously, based on when the turbo is at risk of spinning without full-pressure oil from the main system.

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