TechnologyName:Instructor:Date:Question 6: How do emissions differ in spark ignition and compression ignition engines?Sparks ignitions uses a spark to ignite the compressed fuel and air mixture. It uses gasoline and natural gas. On the other hand, Compression ignition engines compress air to a higher pressure and so it heats the air to the ignition temperature of the fuel that is then injected. A compression ignition engine contains a higher efficiency than the spark ignition engines due to the compression ratio used in the compression engines. Compression ignition engines uses diesel fuel and oil (Thad, 2003).Question 9: What is an equivalence ratio? What is its relationship to pollutant emissions? The equivalence ratio of a...