Passive Filters Questions

• 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 R at an input frequency of 12 kHz?
• 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
• In an RC low-pass filter, the output voltage is taken across the resistor and the output lags the input voltage.
• In an RL low-pass filter, the output voltage is taken across the inductor and the output lags the input.
• A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.
• A band-pass filter rejects all frequencies within a band between a lower and an upper critical frequency and passes all others.
• The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency.
• The output voltage is 63.3% of its maximum at the critical frequencies.
• In an RC high-pass filter, the output is taken across the resistor and the output leads the input.
• Critical frequencies are also called –3 dB frequencies.
• The roll-off rate of a basic RC or RL filter is 20 dB per decade.
• In an RL high-pass filter, the output is taken across the inductor and the output leads the input.