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What is a filter?

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What is a filter?

(a) Frequency selective circuit

(b) Amplitude selective circuit

(c) Frequency damping circuit

(d) Amplitude damping circuit

The question was posed to me in quiz.

The question is from Filters in chapter Fundamentals of Electronics of Avionics

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Right option is (a) Frequency selective circuit

Easy explanation: A filter is a frequency-selective circuit. Filters are designed to pass some frequencies and reject others. Filters are used to reduce noise and increase selectivity.

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