In a combustion process, excess air is typically used to achieve what?

Using excess air in a combustion process serves multiple purposes, leading to various benefits. Firstly, higher fuel efficiency can be achieved because the presence of excess air ensures that more fuel is completely burned, maximizing energy output while minimizing unburned fuel.

Additionally, lower emissions result from the excess air ensuring that the combustion process is more complete. This means fewer harmful byproducts like carbon monoxide and unburned hydrocarbons are produced, which contributes positively to environmental concerns and compliance with regulations.

Furthermore, better combustion stability is facilitated by maintaining a proper air-to-fuel ratio. Excess air helps to stabilize the combustion flame and avoid issues like flame extinction or unstable burning conditions.

The combination of these factors illustrates why using excess air is advantageous in combustion processes. Therefore, utilizing excess air leads to all these benefits, confirming that the choice encompassing all options is the correct answer.