Active Filter MCQS | N4notes

Active Filter MCQS

1. Which filter exhibits a linear phase characteristic?

  • A. Bessel
  • B. Butterworth
  • C. Chebyshev
  • D. all of the above

2. Which filter has a maximally flat response?

  • A. Bessel
  • B. Butterworth
  • C. Chebyshev
  • D. all of the above

3. 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

4. Which filter exhibits the most rapid roll-off rate?

  • A. Bessel
  • B. Butterworth
  • C. Chebyshev
  • D. all of the above

5. A low-pass filter has a cutoff frequency of 1.23 kHz. Determine the bandwidth of the filter.

  • A. 2.46 kHz
  • B. 1.23 kHz
  • C. 644 Hz
  • D. not enough information given

6. The bandwidth in a _____ filter equals the critical frequency.

  • A. low-pass
  • B. high-pass
  • C. band-pass
  • D. band-stop

7. 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

8. A third-order filter will have a roll-off rate of

  • A. –20 dB/decade.
  • B. –40 dB/decade.
  • C. –60 dB/decade.
  • D. –30 dB/decade.

9. A _____ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band.

  • A. low-pass
  • B. high-pass
  • C. band-pass
  • D. band-stop

10. 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

11. Filters with the _____ characteristic provide a very flat amplitude in the passband and a roll-off rate of –20 dB/decade/pole.

  • A. Butterworth
  • B. Chebyshev
  • C. Bessel
  • D. none of the above

12. 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. none of the above

13. Filters with the _____ characteristic are used for filtering pulse waveforms.

  • A. Butterworth
  • B. Chebyshev
  • C. Bessel
  • D. none of the above

14. One important application of a state-variable _____ filter with a summing amplifier is to minimize the 60 Hz “hum” in audio systems.

  • A. low-pass
  • B. high-pass
  • C. band-pass
  • D. band-stop