What is one of the applications of a tachometer in electrical power production?

A tachometer is primarily used to monitor the rotational speed of a shaft, which is crucial in electrical power production, particularly in generators. By providing real-time feedback on the speed at which the generator operates, a tachometer ensures that the generator runs within its optimal speed range.

Maintaining the appropriate speed is vital because the frequency of the electrical output is directly related to the rotational speed of the generator. If the generator operates outside its specified speed range, it can lead to unstable electrical output, potential damage to the equipment, and issues with grid synchronization.

The other options focus on different aspects of electrical operation. Measuring voltage pertains to assessing the electrical potential, assessing power output relates to evaluating the effectiveness of energy conversion, and tracking fuel consumption monitors the efficiency of fuel use in power generation processes. However, none of these directly pertain to the specific function of a tachometer, which is geared towards speed monitoring.