🔍 Key Concepts

• Difference between charging a cylinder and removing exhaust gases • What happens in a 2-stroke diesel engine between power strokes • Role of fresh air at the end of the power stroke

💭 Think About

• Ask yourself: is scavenging mainly about bringing in extra air, or about getting rid of something already in the cylinder? • Which part of the cycle are we talking about: before combustion, during combustion, or right after combustion products are formed? • Which option best describes fresh air interacting with exhaust gases just after the power stroke?

✅ Before You Answer

• Identify which choices describe removal of exhaust gases versus just adding air. • Eliminate any choice that describes combustion itself rather than preparation for the next charge. • Make sure the correct choice involves fresh air being used to clear out burned gases so a new charge can be taken.