🔍 Key Concepts

• Purpose of mist (oil mist) detectors on large slow- and medium-speed diesel engines • What crankcase explosions are and what causes them • Typical locations on an engine where oil mist can form and be dangerous

💭 Think About

• Think about where an explosive mist could form inside a large diesel engine if a bearing overheats or a hot spot develops • Ask yourself which of the listed locations is directly associated with crankcase explosion protection systems • Consider which choice matches standard SOLAS/engine-room safety requirements for large low- and medium-speed main propulsion diesels

✅ Before You Answer

• Identify which answer choice is located inside the engine rather than in external spaces or tanks • Verify which area is directly connected to bearings, connecting rods, and the engine sump (where lubricating oil is present as a spray or fog) • Confirm which monitored area, if it contains oil mist, would pose an immediate risk of crankcase explosion on large main propulsion engines