Which device is used to determine rpm in rotating equipment?

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Multiple Choice

Which device is used to determine rpm in rotating equipment?

Explanation:
When you need to know how fast a rotating piece of equipment is turning, you’re looking for revolutions per minute. A tachometer is built for that purpose and gives a direct readout of rpm. A strobe light often accompanies a tachometer: by flashing at a rate that matches the shaft’s rotation, the moving part can appear stationary, letting you infer rpm from the flash rate (rpm ≈ flash rate in cycles per second × 60). The other instruments measure humidity, temperature, or voltage, which don’t tell you how fast the shaft is turning.

When you need to know how fast a rotating piece of equipment is turning, you’re looking for revolutions per minute. A tachometer is built for that purpose and gives a direct readout of rpm. A strobe light often accompanies a tachometer: by flashing at a rate that matches the shaft’s rotation, the moving part can appear stationary, letting you infer rpm from the flash rate (rpm ≈ flash rate in cycles per second × 60). The other instruments measure humidity, temperature, or voltage, which don’t tell you how fast the shaft is turning.

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