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What can be reduced by using exhaust gas recirculation (EGR) effectively?

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What can be reduced by using exhaust gas recirculation (EGR) effectively?

(a) CO

(b) NOx

(c) HC

(d) CO and HC

I have been asked this question in class test.

This question is from Engine Emissions in division Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

1 Answer

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Correct option is (b) NOx

The explanation is: The most effective way of reducing NOx emission is to hold combustion chamber temperatures down. Using this also reduces the thermal efficiency of the engine.

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