🔍 Key Concepts

• how sound and noise are reduced in exhaust systems • typical construction and purpose of marine diesel engine mufflers • what parts like electrodes or packing usually do on a vessel

💭 Think About

• Which option describes something that would disrupt or break up sound waves in the exhaust flow? • Which choice is commonly associated with corrosion control rather than noise control? • Which options sound more like they deal with gas flow path versus unrelated engine components?

✅ Before You Answer

• Identify which choices directly affect exhaust gas flow and turbulence • Eliminate any option that is primarily used for cathodic protection or corrosion control, not noise • Consider what a muffler looks like internally: multiple chambers, baffles, and changes in flow path to absorb and cancel sound