46. The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is ________.
(a) 0 V
(b) 15 V
(c) 10.60 V
(d) 21.21 V
47. 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
48. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency ________.
(a) is 7 kHz
(b) is 10 kHz
(c) is 12 kHz
(d) cannot be determined
49. A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 μF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter?
(a) 459 Hz
(b) 4,591 Hz
(c) 999 Hz
(d) 2,176 Hz
50. 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
(a) 18 V peak-to-peak
(b) zero
(c) 9 V peak-to-peak
(d) 12.73 V peak-to-peak
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