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Michelin Internal ControlLogix Practice Test

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A notch filter is designed to remove interference at a specific frequency; which frequency is commonly targeted as an example?
Correct Answer:
60 Hz line frequency.
Explanation:
A notch filter works by suppressing a very narrow slice of the spectrum around a specific interference frequency, while leaving nearby frequencies mostly unchanged. Because power-line hum is a common source of interference in many measurement and control systems, the reference example is the 60 Hz line frequency—the standard mains frequency in North America. Narrowly attenuating at 60 Hz removes the hum without disturbing the rest of the signal, which is why this frequency is often used as the illustrative target. The other options don’t fit as well: 5 Hz is far from typical mains noise, 120 Hz is a harmonic that can appear in rectified power but is not the standard demonstration for this concept, and 1 kHz is well outside common line-noise regions.

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