passive filters Mcqs
1. The same signal in Problem 2 is applied to an RC high-pass filter. If the reactance is zero at the input frequency, the output voltage is____________?
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A. 12.73 V peak-to-peak

B. zero

C. 18 V peak-to-peak

D. 9 V peak-to-peak

2. A parallel resonant band-pass filter consists of a 6.8 ? resistor in series with a parallel network made up of an 8 H coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 ?. What is the center frequency of the filter?
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A. 514 kHz

B. 5.03 MHz

C. 503 kHz

D. 5.14 MHz
3. In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?
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A. 3.5 kHz

B. 7 kHz

C. 0 Hz to 3.5 kHz

D. 0 Hz

4. In a certain low-pass filter, fc = 3.5 kHz. Its passband is____________?
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A. 7 kHz

B. 0 Hz

C. 0 Hz to 3.5 kHz

D. 3.5 kHz

5. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency_____________?
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A. is 7 kHz

B. cannot be determined

C. is 10 kHz

D. is 12 kHz
6. At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V.the filters bandwidth is____________?
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A. 11.5 Hz

B. 53 Hz

C. 530 Hz

D. 106 Hz

7. An RC high-pass filter consists of a 0.2 F capacitor and a 220 ? resistor. The output is taken across the resistor. The circuits critical frequency is_____________?
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A. 7,234 Hz

B. 723 Hz

C. 362 Hz

D. 3,617 Hz
8. An RL high-pass filter consists of a 470 ? resistor and a 600 mH coil. The output is taken across the coil. The circuits critical frequency is___________?
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A. 1,250 Hz

B. 5,644 Hz

C. 125 Hz

D. 564 Hz

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

B. 111 mV

C. 11.1 mV

D. 1.1 mV

10. In a certain low-pass filter, fc = 3.5 kHz.if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?
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A. 597 mV

B. 6 V

C. 5.97 V

D. 0 V

11. An RL low-pass filter consists of a 5.6 mH coil and a 3.3 k? resistor. The output voltage is taken across the resistor. The circuits critical frequency is______________?
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A. 86.12 kHz

B. 93.8 Hz

C. 93.8 kHz

D. 861 Hz

12. In a series resonant band-pass filter, a lower value of Q results in______________?
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A. a higher resonant frequency

B. a smaller bandwidth

C. a higher impedance

D. a larger bandwidth
13. The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?
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A. 15 V

B. 21.21 V

C. 0 V

D. 10.60 V
14. An RC high-pass filter consists of an 820 ? resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz?
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A. 161 F

B. 220 F

C. 0.161 F

D. 81 F

15. 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_____________?
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A. 6.02 dB

B. 12.04 dB

C. -12.04 dB

D. -6.02 dB
16. An RC low-pass filter consists of a 120 ? resistor and a 0.002 F capacitor. The output is taken across the capacitor. The circuits critical frequency is___________?
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A. 60 kHz

B. 333 kHz

C. 633 kHz

D. 331 kHz

17. Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is__________?
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A. -8.30 dB

B. 0 dB

C. 0.8 dB

D. 8.30 dB

18. A parallel resonant band-pass filter consists of a 90 ? resistor in series with a parallel network made up of a 60 mH coil and a 0.02 F capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 ?. What is the center frequency of the filter?
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A. 459 Hz

B. 999 Hz

C. 4,591 Hz

D. 2,176 Hz

19. 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____________?
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A. 18 V peak-to-peak

B. 9 V peak-to-peak

C. zero

D. 12.74 V peak-to-peak

20. In a certain low-pass filter, fc = 3.5 kHz. If the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?
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A. 5.97 V

B. 597 mV

C. 0 V

D. 6 V

21. A series resonant band-pass filter consists of a 2 mH coil, a 0.005 F capacitor, and a 120 ? resistor. The winding resistance of the coil is 12 ?. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
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A. 12 V

B. 10.9 V

C. 1.09 V

D. 1.1 V