Gas Fitter Practice Test

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Which instrument is used to measure the speed of a direct drive fan motor?

Voltmeter
Manometer
Anemometer
Tachometer

The correct answer is: Tachometer

The instrument used to measure the speed of a direct drive fan motor is the tachometer. A tachometer is designed specifically to measure the rotational speed of an object, typically in revolutions per minute (RPM). In the context of a fan motor, understanding the speed at which the motor operates is crucial for assessing its performance, energy efficiency, and ensuring it operates within specified limits. While other instruments like a voltmeter and manometer serve different purposes—measuring electrical voltage and fluid pressure, respectively—they do not provide information regarding the rotational speed of motors. An anemometer is used to measure air velocity, which is relevant for airflow assessments but not for directly measuring the speed of the fan motor itself. Thus, the tachometer is the appropriate tool for this specific measurement.