🔍 Key Concepts

• Engine exhaust system design safety requirements • Risk of exhaust gas backflow between engines • Why combining exhausts is restricted on propulsion diesel engines

💭 Think About

• Which option focuses on preventing dangerous interaction between the two engines through the common exhaust? • Do any of the choices describe a safety function rather than a convenience or space-saving reason? • If two engines share an exhaust, what is the main hazard that must be controlled for each engine to operate safely and independently?

✅ Before You Answer

• Identify which choice specifically addresses gas flow direction and isolation between engines • Eliminate answers that talk only about space, size, or added equipment without addressing safety of gas flow • Ask: which condition, if not met, could allow exhaust from one engine to enter or affect the other engine?