Question

the first step in controlling engine emissions is to design the engine in such a way as to reduce emissions as much as possible, such as building -enhancing strategies and precisely controlling valve and spark timing. a. heat b. turbulence c. emissions d. drive

Explanation:

Turbulence - enhancing strategies help in better mixing of air - fuel mixture in an engine. This better mixing leads to more complete combustion. More complete combustion reduces emissions. Heat - enhancing strategies might not directly target emissions reduction in the context of engine design for emissions control. Emissions - enhancing strategies would be counter - productive. Drive - enhancing is not a relevant term in the context of engine design for emissions reduction.

Answer:

B. Turbulence