🔍 Key Concepts

• Explosion relief valves purpose on internal combustion engine crankcases • Difference between design considerations vs. exceptions/omissions • Safety priorities when dealing with crankcase explosions and flame emission

💭 Think About

• Look at which choices sound like broad safety design principles versus very specific exemptions. Which is more likely to be universally true? • Consider what explosion relief valves are trying to prevent. Which option directly addresses the hazard they are meant to control? • Ask yourself if regulations typically allow complete omission of safety devices based only on bore size or monitoring systems, or if they focus more on managing the consequences of an explosion.

✅ Before You Answer

• Verify what the primary hazard is in a crankcase explosion (pressure only, or pressure plus flame and hot gases?) • Check whether regulations commonly allow valves to be omitted entirely just because of small cylinder bore or monitoring systems • Identify which option clearly reflects a fundamental safety objective of explosion relief valves, rather than a conditional design factor.