Where in a plant would a tachometer typically be used?

A tachometer is an instrument used to measure the rotational speed of a shaft or disk, typically in revolutions per minute (RPM). It is commonly found on motors, turbines, or other machinery where precise speed monitoring is essential for efficient operation.

In the context of a plant, the utilization of a tachometer is crucial for understanding and controlling the performance of rotating equipment. By providing real-time speed data, a tachometer helps operators ensure that machines are running within their optimal parameters, which is vital for maintaining performance and preventing mechanical failures.

In contrast, while areas like the boiler room, cooling towers, or chemical mixing areas involve various instruments and controls, they do not primarily rely on measuring rotational speeds as a core function. Therefore, the presence of a tachometer is specifically relevant to machinery like motors and turbines, making it the correct choice for the question.