Discussion
Statement I: Exhaust gas recirculation lowers nitrogen oxide emissions.
Statement II: Recirculated exhaust absorbs combustion heat without contributing any of its own.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the mechanism. Recirculated exhaust is inert: it takes up heat as the charge burns without releasing any, so the peak flame temperature falls.
Since thermal formation of nitrogen oxides rises steeply with temperature, a modest reduction cuts the emission substantially. The cost is combustion quality - too much recirculation makes the burn slow and unstable - which is why the rate is scheduled against load and speed rather than applied continuously.
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