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Inductors - Technical MCQs

Q1:

A series RL filter circuit with an output across the inductor will result in what type of filtering?

A passing of the higher frequencies

B passing of the lower frequencies

C blocking of the higher frequencies

D blocking of a certain range of frequencies

ANS:A - passing of the higher frequencies

If the output is taken across the inductor, high frequencies are passed and low frequencies are attenuated (rejected). Thus, the circuit behaves as a high-pass filter. If, though, the output is taken across the resistor, high frequencies are rejected and low frequencies are passed. In this configuration, the circuit behaves as a low-pass filter. Compare this with the behaviour of the resistor output in an RC circuit, where the reverse is the case.