21. Filters with the ________ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than –20/dB/decade/pole.
(a) Butterworth
(b) Chebyshev
(c) Bessel
(d) Either Chebyshev or Bessel
22. A ________ filter rejects all frequencies within a specified band and passes all those outside this band.
(a) low-pass
(b) high-pass
(c) band-pass
(d) band-stop
23. A ________ filter significantly attenuates all frequencies below fc and passes all frequencies above fc.
(a) low-pass
(b) high-pass
(c) band-pass
(d) band-stop
24. The critical frequency is defined as the point at which the response drops ________ from the passband.
(a) –20 dB
(b) –3 dB
(c) –6 dB
(d) –40 dB
25. Nota
Related Posts
Filters » Exercise - 110. A high pass filter is one which : (a) passes all high frequencies (b) attenuates all low frequencies (c) attenuates all frequencies below a designated cut-off frequency, and passes all frequencies above cut-off (d) none of these- 555555555543. A low-pass filter ________. (a) provides a constant output up to the cutoff frequency (b) passes frequencies from zero up to the cutoff frequency (c) rejects all frequencies above the cutoff frequency (d) All of the above
- Filters » Exercise - 19. A low pass filter is one which : (a) passes all low frequencies (b) attenuates all high frequencies (c) passes all frequencies up to cut-off frequency, and attenuates all other frequencies (d) none of these
- 5555555555 52. An RC low-pass filter consists of a 120 Ω resistor and a 0.002 μF capacitor. The output is taken across the capacitor. The circuit's critical frequency is ________. (a) 333 kHz (b) 633 kHz (c) 331 kHz (d) 60 kHz
- Filters » Exercise - 115. A band elimination filter is one : (a) which attenuates all frequencies less than lower cut-off frequency f1 (b) which attenuates all frequencies greater than upper cut-off frequency f2 (c) frequencies lying between f1 andf2 are attenuated and all other frequencies are passed (d) none of these