🔍 Key Concepts

• two-stroke (two-cycle) diesel engines and how they clear cylinders between power strokes • difference between moving fresh air through the engine vs increasing intake pressure for more power • specific meaning of terms: scavenging, turbo charging, forced draft, and aspiration in marine engineering

💭 Think About

• In a two-cycle diesel, what exactly has to happen to the burned gases at the end of each power stroke so the next charge can enter? • Which of the listed terms is specifically used for the process of sweeping exhaust gases out of the cylinder, rather than for boosting power or supplying air to a boiler/engine room? • Think about where each process happens: Is it inside the cylinder, in the intake system, or in the engine room/boiler furnace? Which term matches the cylinder-cleaning process?

✅ Before You Answer

• Identify which term is defined as clearing exhaust gases from the cylinder with the help of incoming air. • Verify which option normally refers to air supplied to furnaces or spaces rather than to the cylinder-clearing process. • Distinguish between a device/process that boosts intake pressure for more power and a process that removes spent gases from the cylinder.