What does a tachometer measure?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

A tachometer specifically measures the rotation speed of a shaft or disk, typically expressed in revolutions per minute (RPM). This instrument is essential in various applications, including engines, turbines, and any rotating machinery where it is crucial to monitor the speed to ensure optimal performance and prevent damage due to excessive speeds. Understanding the rotation speed allows engineers to maintain operational efficiency and safety standards in mechanical systems.

The other options, while related to different aspects of engineering and mechanical systems, do not pertain to the function of a tachometer. Voltage is monitored by voltmeters, temperature by thermometers or thermocouples, and pressure in gas pipelines by pressure gauges, each serving their specific purpose in the realm of measuring and monitoring electrical, thermal, and fluid systems, respectively.

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