Terminology of resonant circuits — is a series resonant circuit commonly called a “tank circuit”?

Difficulty: Easy

Correct Answer: False

Explanation:


Introduction / Context:
The term “tank circuit” is widely used in RF and analog electronics. Proper terminology matters for communication among engineers and for understanding oscillator and filter topologies.


Given Data / Assumptions:

  • Two common resonant topologies: series LC and parallel LC (both possibly with resistance).
  • Industry usage and standard textbooks typically associate “tank” with the parallel form.


Concept / Approach:

A tank circuit is most commonly a parallel LC network that can store and exchange energy between the inductor and capacitor, maintaining oscillation when lightly loaded. The high impedance at resonance in a parallel LC and its energy storage behavior inspire the tank analogy. Although both series and parallel LC resonate, the term “tank circuit” is not commonly used for the series resonant form.


Step-by-Step Solution:

Identify standard usage: “tank” refers to a parallel resonant LC network.Series LC at resonance has minimum impedance and is used for impedance matching or selective current peaking, not typically called a tank.Therefore, stating that a series resonant circuit is commonly called a tank circuit is not correct.


Verification / Alternative check:

Oscillator schematics and RF textbooks show LC tanks as parallel networks feeding active devices, further confirming common usage.


Why Other Options Are Wrong:

  • Conditions like very high Q or negligible resistance do not change the conventional naming.
  • The RF versus power qualifier is unnecessary; the terminology is consistent across domains.


Common Pitfalls:

Assuming any LC pair is a tank. Be precise: series LC is typically a notch or series resonator; parallel LC is the canonical tank.


Final Answer:

False

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