Red Seal Electrician Practice
Meters and troubleshootingQuestion 1184 of 1506

In a vibrating-reed frequency meter, which reed shakes the most?

  1. The longest reed in the row
  2. The shortest reed in the row
  3. The reed that resonates near the AC frequency
  4. All reeds shake by the same amount
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Correct answer: The reed that resonates near the AC frequency

Mechanical resonance makes the matching reed move the most.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 12.2: Frequency and Phase Measurement

Practice meters and troubleshooting

Questions last reviewed: 18 October 2026