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  • Question
  • 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

  • Correct Answer
  • 125 Hz 


  • Passive Filters problems


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    • 1. 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
    • 2. 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
    • 3. Referring to Problem 21, the filter's bandwidth is

    • Options
    • A. 11.5 Hz
    • B. 530 Hz
    • C. 53 Hz
    • D. 106 Hz
    • 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. 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
    • 6. 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
    • 7. 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
    • 8. An RC high-pass filter consists of an 820 Ω resistor. What is the value of C so that Xc is ten times less than R at an input frequency of 12 kHz?

    • Options
    • A. 81 µF
    • B. 161 µF
    • C. 0.161 µF
    • D. 220 µF
    • Discuss
    • 9. A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is

    • Options
    • A. 18 V peak-to-peak
    • B. zero
    • C. 9 V peak-to-peak
    • D. 12.74 V peak-to-peak
    • Discuss
    • 10. In an RC differentiator, responding to repetitive pulses, the average value of the output

    • Options
    • A. is zero
    • B. is equal to the input voltage
    • C. is 63 percent of the input voltage
    • D. cannot be determined
    • Discuss


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