The frequency of a generator set is controlled by which component?

The frequency of a generator set is primarily controlled by the governor. The governor is a critical component that regulates the speed of the generator's engine. As the engine speed directly correlates with the frequency of the electrical power output, any adjustments made by the governor in response to load changes or other factors will influence the frequency. When the load on the generator increases, the governor senses this change and adjusts the fuel supply to the engine to maintain a constant speed, thereby stabilizing the frequency of the output electrical signal.

Other components mentioned, such as transformers, rectifiers, and starters, serve different purposes. For instance, transformers are used to change voltage levels, rectifiers convert alternating current (AC) to direct current (DC), and starters serve to initiate the operation of the generator. Therefore, while these components are essential for the overall operation and performance of a generator set, they do not have a role in controlling frequency. The governor's functionality is key in ensuring that the generator produces electricity at the correct frequency.