Active Filters Questions and Answers

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Showing 10 of 26 questions
Q11
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
Answer: Option B
Q12
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 [NIL]
Answer: Option A
Q13
Which filter exhibits the most rapid roll-off rate?
  • A Bessel
  • B Butterworth
  • C Chebyshev
  • D all of the above
Answer: Option C
Q14
Which filter has a maximally flat response?
  • A Bessel
  • B Butterworth
  • C Chebyshev
  • D all of the above
Answer: Option B
Q15
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 644 Hz
Answer: Option B
Q16
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.
Answer: Option C
Q17
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
Answer: Option C
Q18
A band-pass filter can be created by cascading a high-pass filter and a low-pass filter.
  • A TRUE
  • B FALSE
Answer: Option A
Q19
The bandwidth of a band-pass filter is the sum of the two cutoff frequencies.
  • A TRUE
  • B FALSE
Answer: Option B
Q20
A Sallen-Key filter is a second-order filter.
  • A TRUE
  • B FALSE
Answer: Option A

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