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The impedance of a line is zero when ___________(a) It acts as inductor(b) It acts as capacitor(c) It acts as a resistor(d) Series resonant circuitThe question was asked during a job interview.This intriguing question comes from Transmission Lines as Circuit Elements topic in section Transmission Lines of Avionics

Answer»

The correct choice is (d) Series RESONANT circuit

Easy EXPLANATION: If the line ACTS as a series resonant circuit, its impedance is ZERO. If the line is of such a length that it acts as a parallel resonant circuit, its impedance is near infinity. If the line is some intermediate length, it is REACTIVE.



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