Question

An electrical filter is a

(a) Phase-selective circuit

(b) Frequency-selective circuit

(c) Filter-selective circuit

(d) None of the mentioned

I have been asked this question during an online exam.

I would like to ask this question from Active Filters in division Active Filters of Linear Integrated Circuits

Answer 1

The correct answer to the question is:

(b) Frequency-selective circuit

Explanation:

An electrical filter is a circuit designed to allow certain frequencies to pass while attenuating others. It is frequency-selective because it can either allow or block specific frequency ranges, depending on the type of filter (e.g., low-pass, high-pass, band-pass, or band-stop filters). The filter works by manipulating the frequency response of the circuit.

Why not the other options?

• Phase-selective circuit: Although filters can affect the phase of a signal, their primary function is frequency selection, not phase selection.
• Filter-selective circuit: This is not a standard term used in the context of electrical filters.
• None of the mentioned: This would be incorrect because an electrical filter is indeed frequency-selective.

Thus, an electrical filter is a frequency-selective circuit.