Red Seal Electrician Practice
AC theoryQuestion 998 of 1506

What is the total impedance of an ideal parallel tank circuit at resonance?

  1. Zero
  2. Equal to the inductive reactance
  3. Very high (approaching infinity)
  4. Equal to the sum of the two reactances
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Correct answer: Very high (approaching infinity)

The equal reactances cancel in the supply line, so the circuit acts like an open circuit.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 6.2: Simple Parallel (Tank Circuit) Resonance

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Questions last reviewed: 18 October 2026