🔍 Key Concepts

• Crankcase explosions and how they are prevented • Difference between a breather and a vent line • What "slight suction not exceeding 1" of water" is meant to control

💭 Think About

• Which option best allows continuous, controlled removal of vapors from an enclosed crankcase without letting too much air enter suddenly? • Which design is commonly used on diesel engines to reduce the risk of internal pressure buildup and ignition of oil mist? • Look for the choice that combines both a path for ventilation and a limit on how strong the suction or draft can be.

✅ Before You Answer

• Identify which choices mention control of suction/pressure (important for crankcase safety). • Check which options are standard terminology in diesel engine practice (e.g., "breather" versus a generic hole or vent). • Eliminate any option that sounds like an uncontrolled opening that might not properly manage oil mist and crankcase pressure.