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.Management Sciences
Category: Passive Filters
In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?
0
A. 0 Hz to 3.5 kHz
B. 0 Hz
C. 3.5 kHz
D. 7 kHz
A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?
A. 5.14 MHz
B. 514 kHz
C. 5.03 MHz
D. 503 kHz
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. 12.73 V peak-to-peak
B. 18 V peak-to-peak
C. 9 V peak-to-peak
D. zero
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
The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?
A. 10.60 V
B. 0 V
C. 21.21 V
D. 15 V
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
A series resonant band-pass filter consists of a 2 mH coil, a 0.005 µF capacitor, and a 120 Ω resistor. The winding resistance of the coil is 12 Ω. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
A. 10.9 V
B. 1.09 V
C. 1.1 V
D. 12 V
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
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
In a series resonant band-pass filter, a lower value of Q results in______________?
A. a higher impedance
B. a smaller bandwidth
C. a higher resonant frequency
D. a larger bandwidth
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