Question 32 AEL01 - Assistant Engineer - Limited

The Correct Answer is B **Explanation for Option B (Injecting fuel at the proper time):** The primary purpose of a fuel injection system, particularly in modern and diesel engines, extends beyond merely measuring and spraying the fuel (metering and atomizing). The system must precisely control *when* the fuel is introduced into the engine cycle (timing). Correct timing is crucial for optimal engine performance, efficiency, and emissions control, ensuring the fuel is injected exactly when the piston is in the correct position relative to the compression or intake stroke to facilitate complete and powerful combustion. **Explanation of Incorrect Options:** * **A) Creating turbulence in the combustion chamber:** While turbulence (swirl/tumble) is important for mixing, it is primarily achieved through the design of the intake ports and piston crown, not the injection system itself. The injection system atomizes the fuel, but the engine geometry handles the large-scale airflow movement. * **C) Minimizing fuel penetration into the cylinder:** This statement is contradictory to the system's function. The purpose is to achieve *optimal* penetration and spread throughout the combustion chamber for efficient mixing, not to minimize it. * **D) Aiding in completing cylinder scavenging:** Scavenging (the process of pushing exhaust gases out of the cylinder) is primarily controlled by the valve timing (overlap) and exhaust system design, not the fuel injection system. Fuel injection occurs after scavenging is complete or during the intake stroke.