Engineering Board Exam Reviewer · Passive Filters · easy

A low-pass filter

  1. passes high frequencies and attenuates frequencies below its cutoff
  2. passes low frequencies and attenuates frequencies above its cutoff
  3. passes only a narrow band of frequencies
  4. attenuates only a narrow band of frequencies

Answer

B. passes low frequencies and attenuates frequencies above its cutoff

Solution

A low-pass filter lets frequencies below the cutoff pass with little loss and increasingly attenuates frequencies above it.

More Passive Filters questions

  1. The RC high-pass filter shown uses R=4.7 k and C=22 nF. Find its cutoff frequency.
  2. The RC low-pass filter shown uses R=15 k and C=10 nF. Find its cutoff frequency.
  3. Two identical RC low-pass sections, each with a cutoff of 1 kHz, are cascaded with a buffer between them so that the sections do not load…
  4. A first-order RC high-pass filter delivers 3.5 V rms for a 10 V rms input at 500 Hz. What is its cutoff frequency?
  5. In the loaded low-pass filter shown, R1=1 k , R2=1.5 k (the load), and C=100 nF. Find the cutoff frequency.
  6. The band-stop (notch) filter shown has R=220, , L=25 mH, and C=400 nF. At what frequency is the output voltage (ideally) zero?
  7. A band-pass filter has half-power frequencies of 3 kHz and 12 kHz. Its center frequency, taken as the geometric mean, is
  8. A second-order passive low-pass filter (two reactive sections) rolls off at what rate beyond its cutoff frequency?
  9. A series resonant band-pass filter has a center frequency of 10 kHz and a quality factor of 25. What is its bandwidth?
  10. An RC low-pass filter is driven by a 10 V signal at ten times its cutoff frequency. Find the output voltage.

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