Which outcome results when rapid, uncontrolled fuel ignition occurs within each engine cycle?

💡 Explanation

Uncontrolled fuel ignition produces detonation, driving down performance; because much less energy does useful work, the system dissipates energy as waste heat via entropy, overall thermal efficiency decreases; therefore Option A is correct, rather than better fuel economy.

• Which consequence results when excessive mechanical stress narrows energy band?
• Which outcome occurs when a nickel catalyst's surface area decreases in a hydrogenation reactor?
• Which consequence results when increased compressive stress exceeds rock's Hugoniot elastic limit?
• Which outcome occurs when high pressure induces allotropic transition in steel?
• Which outcome arises when an overheated plasma etcher's cooling system fails?
• Which risk increases to a material during molecular 3D printing which deposits heated polymer layers beyond their thermal stability limit?