Objective Type Questions on Passive Filters

Practice Test: Question Set - 03


1. 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
    (A) 18 V peak-to-peak
    (B) Zero
    (C) 9 V peak-to-peak
    (D) 12.74 V peak-to-peak

2. An RC high-pass filter consists of a 0.2 μF capacitor and a 220 Ω resistor. The output is taken across the resistor. The circuit's critical frequency is
    (A) 723 Hz
    (B) 7,234 Hz
    (C) 362 Hz
    (D) 3,617 Hz

3. In an RL low-pass filter, the output voltage is taken across the inductor and the output lags the input.
    (A) True
    (B) False

4. 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?
    (A) 5.14 MHz
    (B) 514 kHz
    (C) 5.03 MHz
    (D) 503 kHz

5. The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency.
    (A) True
    (B) False

6. 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
    (A) 93.8 kHz
    (B) 93.8 Hz
    (C) 861 Hz
    (D) 86.12 kHz

7. A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.
    (A) True
    (B) False

8. 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?
    (A) 1.1 mV
    (B) 11.1 mV
    (C) 111 mV
    (D) 200 mV

9. The roll-off rate of a basic RC or RL filter is 20 dB per decade.
    (A) True
    (B) False

10. 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
    (A) 125 Hz
    (B) 1,250 Hz
    (C) 564 Hz
    (D) 5,644 Hz

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Item Reviewed: Objective Type Questions on Passive Filters Rating: 5 Reviewed By: Pranab Debnath
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