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

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

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

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

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

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, R_W, 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