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Passive Filters problems

  • 1. A series resonant band-stop filter consists of a 68 Ω resistor, a 110 mH coil, and a 0.02 µF capacitor. The internal resistance, RW, of the coil is 4 Ω. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0?

  • Options
  • A. 1.1 mV
  • B. 11.1 mV
  • C. 111 mV
  • D. 200 mV
    • Discuss
  • 2. In a certain low-pass filter, fc = 3.5 kHz. Its passband is

  • Options
  • A. 0 Hz to 3.5 kHz
  • B. 0 Hz
  • C. 3.5 kHz
  • D. 7 kHz
    • Discuss
  • 3. A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?

  • Options
  • A. 5.14 MHz
  • B. 514 kHz
  • C. 5.03 MHz
  • D. 503 kHz
    • Discuss
  • 4. Referring to Problem 8, assume the input voltage is 15 V ac. What is the output voltage at the critical frequency,fc?

  • Options
  • A. 0 V
  • B. 7.07 V
  • C. 15 V
  • D. 10.6 V
    • Discuss
  • 5. Referring to Problem 21, the filter's bandwidth is

  • Options
  • A. 11.5 Hz
  • B. 530 Hz
  • C. 53 Hz
  • D. 106 Hz
    • Discuss
  • 6. A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 µF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter?

  • Options
  • A. 459 Hz
  • B. 4,591 Hz
  • C. 999 Hz
  • D. 2,176 Hz
    • Discuss
  • 7. An RL low-pass filter consists of a 5.6 mH coil and a 3.3 kΩ resistor. The output voltage is taken across the resistor. The circuit's critical frequency is

  • Options
  • A. 93.8 kHz
  • B. 93.8 Hz
  • C. 861 Hz
  • D. 86.12 kHz
    • Discuss
  • 8. An RL high-pass filter consists of a 470 Ω resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is

  • Options
  • A. 125 Hz
  • B. 1,250 Hz
  • C. 564 Hz
  • D. 5,644 Hz
    • Discuss
  • 9. Referring to Problem 8, assume the input voltage is 15 V dc. What is the output voltage?

  • Options
  • A. 0 V
  • B. 15 V
  • C. 7.07 V
  • D. 10.6 V
    • Discuss
  • 10. At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is

  • Options
  • A. 6.02 dB
  • B. ?6.02 dB
  • C. 12.04 dB
  • D. ?12.04 dB
    • Discuss

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