Which outcome arises when excessive fuel accumulates in an internal combustion engine's catalytic converter?

💡 Explanation

When unburnt fuel enters the catalytic converter, rapid oxidation occurs on the catalyst surface because of platinum/palladium acceleration, leading to a large temperature increase and potential thermal runaway with catalyst damage. Therefore thermal runaway results, rather than other mechanical failures which require different fuel-related conditions.

• Which risk increases when a silicon-controlled rectifier's (SCR) gate loses control?
• Which outcome arises when hydraulic actuator's proportional valve response time exceeds control loop's update rate?
• Which consequence results when PLC clock drift affects a bottling plant’s synchronised conveyor system?
• Which outcome occurs prematurely in a chiller using liquid refrigerant when evaporator load is substantially reduced?
• Which risk increases when a power MOSFET operating near its rated voltage experiences a sudden inductive load disconnection?
• Which outcome occurs when improperly sized breakers are installed in a critical uninterrupted power supply's (UPS) distribution panel?