Which outcome occurs in a modern gasoline direct injection engine operating at high temperature with lean fuel mixture?

💡 Explanation

When a lean fuel mixture is burned at high temperature in a GDI engine, Zeldovich mechanism prevails, resulting in increased nitrogen oxide (NOx) formation due to the higher availability of oxygen atoms at elevated temperature. Therefore increased NOx formation results, rather than reduced knock or improved efficiency which happens at rich mixtures, or increased particulates which relates to incomplete combustion of the fuel.

• Which outcome occurs when a distribution transformer experiences prolonged operation above its voltage tap setting?
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• Which risk increases in a welded steel bridge if improper preheating during joint construction is practiced?
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• Which outcome occurs in a PID-controlled chemical reactor if the derivative gain is excessively increased?
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