The line trap unit employed in carrier current relaying method offers:

The line trap unit employed in carrier current relaying method offers: (A) high impedance to 50 Hz power frequency signal (B) high impedance to carrier frequency signal (C) low impedance to carrier frequency signal (D) high impedance to 50 Hz power frequency signal and high impedance to carrier frequency signal
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The line trap unit employed in carrier current relaying method offers: high impedance to carrier frequency signal 

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Last Answer : Ans: B The line trap unit employed in carrier current relaying offers high impedance to carrier frequency signal. Because carrier frequency range is 35 km – 500 kHz XL = 2Π f l Where f increases XL will also increases

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