Exam Question

### (a) Operation of an Electronic Governor for an Auxiliary Diesel Engine
An electronic governor's primary function is to maintain a constant engine speed (and thus, alternator frequency) under varying electrical loads. It achieves this by precisely controlling the amount of fuel delivered to the engine. Its operation can be described by the interaction of its main components:
**1. Key Components:**
* **Speed Sensor (Magnetic Pick-Up - MPU):** This unit senses the engine's rotational speed. It consists of a permanent magnet with a surrounding coil, positioned with a small air gap from a set of ferrous gear teeth mounted on a rotating part of the engine (e.g., flywheel).