AG Mechanics CDE Practice Exam 2026 – The Comprehensive All-in-One Guide for Success

The throttle is the part of the carburetor that controls the amount of air and fuel that enters the engine, thereby controlling the engine speed. The choke, on the other hand, controls the amount of air entering the engine when it is cold, and the float maintains the fuel level in the carburetor. The venturi is responsible for creating a vacuum that draws in the air and fuel mixture. While all of these parts play important roles in the functioning of the carburetor, only the throttle directly controls engine speed. Therefore, the throttle is the correct answer.