Shaft/rotor speed is most accurately measured by a_________________?
Correct answer: C. Strobometer
- A. Frequency counter
- B. Tachometer
- C. Strobometer
- D. Speedometer
Explanation
A strobometer determines rotational speed from the stationary image produced when flashing frequency matches the shaft speed, allowing accurate non-contact measurement. A tachometer also measures speed, but the stroboscopic instrument is the more precise choice here.
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