Final answer:
The device that controls the ratio of the fuel/air mixture in an internal combustion engine is called the carburetor (in older engines) or the fuel injector (in modern engines).
Step-by-step explanation:
The device that controls the ratio of the fuel/air mixture to the cylinder in an internal combustion engine is called the carburetor (in older engines) or the fuel injector (in modern engines).
In an internal combustion engine, fuel and air are mixed together in the proper proportion before being introduced into the cylinder. The device responsible for controlling this mixture is crucial for the engine's performance and efficiency.
The carburetor, which was used in older engines, is a device that blends the fuel and air together in the right ratio. It uses the Venturi effect to create a pressure difference, drawing in the fuel and mixing it with the air.
Modern engines, on the other hand, use fuel injectors to deliver the fuel directly into the cylinder. The fuel injector injects small, metered amounts of fuel into the intake manifold or directly into the combustion chamber, ensuring precise control over the fuel/air mixture.