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When does an open transmission line look like an inductor to the generator?(a) Length is one quarter wavelength(b) Length is between one quarter and one half of wavelength(c) Length is more the one half of the wavelength(d) At all timesI have been asked this question in final exam.My query is from Transmission Lines as Circuit Elements in chapter Transmission Lines of Avionics

Answer»

The correct answer is (b) Length is between ONE quarter and one HALF of wavelength

To explain I would say: If the open TRANSMISSION line is less than one-quarter wavelength, the generator sees a CAPACITANCE. If the line is between one-quarter and one-half wavelength, the generator sees an INDUCTANCE. These characteristics repeat for lines that are some multiple of one-quarter or one-half wavelengths.



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