Technology Questions Chapter 9

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Questions are based on chapter 9 of the following book: Air Quality 4th Edition, Thad Godish. This should be the required source. Question 6: How do emissions differ in spark ignition and compression ignition engines? Question 9: What is an equivalence ratio? What is its relationship to pollutant emissions? Question 13: Describe the principle of exhaust gas recirculation and the pollutant that it controls.