Name two major components of a supervisory electronic engine control?

• A. The electronic control unit (computer) and hydro-mechanical fuel control.
• B. The throttle body and ignition coil.
• C. The fuel pump and exhaust sensor.
• D. The intake manifold and oxygen sensor.

Answer: (A)

The supervisory electronic engine control relies on two main elements: an electronic control unit (the computer) and a hydro-mechanical fuel control. The electronic control unit acts as the brain, taking in sensor data (like engine speed, pressure, and throttle position) and computing the appropriate fuel and timing schedule. It then governs the hydro-mechanical fuel control, which is the device that physically meters the fuel flow to the engine using hydraulic pressure and mechanical linkages. This combination provides precise, coordinated control of fuel delivery and engine operation.

Other options mix components that serve different roles (air intake, ignition, exhaust sensing, or separate subsystems) and are not the two major components that comprise the supervisory electronic engine control system.