🔍 Key Concepts

• diesel engine shutdown methods (mechanical vs electrical) • how fuel supply and air supply affect diesel combustion • which actions would be unsafe or damaging as a way to stop an engine

💭 Think About

• Think about what a diesel engine absolutely needs to keep running. Which of the options removes that key requirement in a controlled way? • Which choice would be realistic to use repeatedly in normal operations without damaging the engine or creating a hazard? • Consider how an emergency stop button on an engine is most likely wired: what component does it control?

✅ Before You Answer

• Eliminate any option that would increase stress or danger to the engine as a means of stopping it. • Ask yourself which method is simple, reliable, and quick to act electrically. • Confirm which option aligns with common design of engine emergency stop systems on vessels.