Question

A filter which passes without attenuation all frequencies up to the cut-off frequency fc and attenuates all other frequencies greater than fc is called?

(a) high pass filter

(b) low pass filter

(c) band elimination filter

(d) band pass filter

I had been asked this question in an online interview.

My query is from Filter Networks topic in division Filters and Attenuators of Network Theory

Answer 1

Right choice is (b) low pass filter

To explain I would say: A filter is called a low pass filter if it passes all frequencies up to the cut-off frequency fc without attenuation and attenuates all other frequencies greater than fc. This transmits currents of all frequencies from zero up to the cut-off frequency.