Which two types of fuel metering systems are most commonly used in internal combustion engines?

The correct response identifies carbureted systems and fuel-injected systems as the most commonly used types of fuel metering systems in internal combustion engines. Carbureted systems, which were once the standard, mix air and fuel mechanically before delivering it to the engine. They rely on a vacuum created by the engine to draw fuel into the airstream, allowing for the mixture to combust effectively.

Fuel injection, on the other hand, has gained prominence for its efficiency and precision. It uses electronic control to inject fuel directly into the combustion chamber or the intake manifold, allowing for better atomization, improved fuel efficiency, and reduced emissions. The transition to fuel injection systems has largely been driven by advancements in technology and regulatory requirements for cleaner, more efficient engine performance.

The other options introduce different concepts that do not directly relate to the primary fuel metering methodologies. Mechanical and electrical systems refer broadly to the types of mechanisms used in various parts of the engine rather than solely focusing on fuel delivery methods. Diesel and gasoline systems pertain more to the types of fuels used rather than the specific metering systems for those fuels. Turbocharged and naturally aspirated systems describe engine configurations related to how they draw and use air for combustion but do not directly address how fuel is