Question: In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is_______________?

• 1. 0 Hz to 3.5 kHz
• 2. 0 Hz
• 3. 3.5 kHz
• 4. 7 kHz

Question: An RC high-pass filter consists of an 820 Ω resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz?

• 1. 81 µF
• 2. 161 µF
• 3. 0.161 µF
• 4. 220 µF

Question: In a series resonant band-pass filter, a lower value of Q results in______________?

• 1. a higher impedance
• 2. a smaller bandwidth
• 3. a higher resonant frequency
• 4. a larger bandwidth

Question: The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is_____________?

• 1. 10.60 V
• 2. 0 V
• 3. 21.21 V
• 4. 15 V

Question: 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____________?

• 1. 12.73 V peak-to-peak
• 2. 18 V peak-to-peak
• 3. 9 V peak-to-peak
• 4. zero

Question: 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____________?

• 1. 18 V peak-to-peak
• 2. zero
• 3. 9 V peak-to-peak
• 4. 12.74 V peak-to-peak

Question: Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is__________?

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

Question: 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?

• 1. 5.14 MHz
• 2. 514 kHz
• 3. 5.03 MHz
• 4. 503 kHz

Question: 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?

• 1. 0 V
• 2. 5.97 V
• 3. 6 V
• 4. 597 mV

Question: 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______________?

• 1. 93.8 kHz
• 2. 93.8 Hz
• 3. 861 Hz
• 4. 86.12 kHz