Resonance and its applications

Explanation of question 10

The tuned circuit in Fig. 10.4 can be used to

  1. increase the input impedance of the receiver
  2. improve the receiver earth connection
  3. accept a required signal
  4. bypass an interfering signal

The answer is :- 4 The impedance of the series tuned circuit will be zero when at the resonant frequency. An interfering signal may therefore by-passed by adjusting the variable capacitor until the tuned circuit's resonant frequency coincides with that of the interfering signal.

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