Passive Filters MCQs

Q. A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.

  1. True
  2. False

Answer
(b)

Q. The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency.

  1. True
  2. False

Answer
(a)

Q. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency

  1. is 7 kHz
  2. is 10 kHz
  3. is 12 kHz
  4. cannot be determined

Answer
(c)

Q. Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is

  1. 0 dB
  2. 8.30 dB
  3. -8.30 dB
  4. 0.8 dB

Answer
(c)

Q. 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?

  1. 1.1 mV
  2. 11.1 mV
  3. 111 mV
  4. 200 mV

Answer
(b)
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