MDE 5 Q2

Answer: A) Nozzle tip
C) Needle valve
E) Spring
Explanation: In a cross section through the nozzle of a fuel injector, the main components typically include the nozzle tip, needle valve, and spring. The nozzle tip is where the fuel is ejected, the needle valve controls the opening and closing of the nozzle, and the spring helps maintain the correct position of the needle valve.

Answer: B) The process of breaking down fuel into fine droplets for efficient mixing with air
Explanation: Atomization refers to the process of breaking down the fuel into fine droplets, which allows for better mixing with air in the combustion chamber. This enhances combustion efficiency and overall engine performance.

Answer: A) The depth to which fuel droplets penetrate into the combustion chamber
Explanation: In diesel engine fuel injection, "penetration" refers to the depth to which the fuel droplets travel into the combustion chamber. Effective penetration ensures that the fuel reaches the areas where it can mix thoroughly with air for optimal combustion.