Active and Passive Filters – Exercise – 2

56. In a certain low-pass filter, fc = 3.5 kHz. Its passband is ________.

(a) 0 Hz to 3.5 kHz
(b) 0 Hz
(c) 3.5 kHz
(d) 7 kHz

Answer
Answer : (a)
Explanation
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57. 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

Answer
Answer : (a)
Explanation
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58. 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

Answer
Answer : (d)
Explanation
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59. 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 ________.

(a) 6.02 dB
(b) –6.02 dB
(c) 12.04 dB
(d) –12.04 dB

Answer
Answer : (b)
Explanation
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60. 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

Answer
Answer : (b)
Explanation
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