For signal frequencies exceeding resonance, a series LC network functions as a ____________load?
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Answer: B. Inductive
Explanation
Inductive reactance increases directly with signal frequency according to the standard formula for inductors. When operating above the resonant frequency, inductive reactance exceeds capacitive reactance in a series LC circuit. This dominant inductive reactance causes the entire series network to present an inductive load characteristic. Series LC circuit impedance depends on frequency, with capacitive reactance dominating below resonance and inductive above. At the exact resonant frequency, inductive and capacitive reactances cancel out, leaving only pure resistive impedance. Frequency response curves of resonant filters illustrate how phase and impedance shift above and below resonance.
Filter design engineers analyze above-resonance behavior to ensure unwanted high frequency signals are blocked effectively. Impedance matching networks rely on frequency-dependent reactive characteristics to transfer power efficiently. Understanding circuit reactance helps technicians troubleshoot frequency-selective electronic filter networks. A resistive load occurs only at the exact resonant frequency where reactances completely cancel each other out. Capacitive load characteristics occur when operating below the resonant frequency where capacitive reactance dominates. Option B is the correct choice because higher frequencies make the series LC network predominantly inductive.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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