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Electrical Engineering
Passive Filters
Quiz 4
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Q.1
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
93.8 kHz
93.8 Hz
861 Hz
86.12 kHz
Q.2
An RC high-pass filter consists of a 0.2 µF capacitor and aΩ resistor. The output is taken across the resistor. The circuit's critical frequency is
723 Hz
7,234 Hz
362 Hz
3,617 Hz
Q.3
The maximum output voltage of a certain low-pass filter isV. The output voltage at the critical frequency is
0 V
15 V
10.60 V
21.21 V
Q.4
An RC low-pass filter consists of aΩ resistor and a 0.µF capacitor. The output is taken across the capacitor. The circuit's critical frequency is
333 kHz
633 kHz
331 kHz
60 kHz
Q.5
The output voltage is 63.of its maximum at the critical frequencies.
True
False
Q.6
At a certain frequency, the output voltage of a filter is 6 V and the input isV. The voltage ratio in decibels is
6.02 dB
-6.02 dB
12.04 dB
-12.04 dB
Q.7
In an RC high-pass filter, the output is taken across the resistor and the output leads the input.
True
False
Q.8
A series resonant band-pass filter consists of a 2 mH coil, a 0.µF capacitor, and aΩ resistor. The winding resistance of the coil isΩ. The output voltage is taken off the resistor. Input voltage isVrms. What is the output voltage magnitude at the center frequency (f0)?
10.9 V
1.09 V
1.1 V
12 V
Q.9
The roll-off rate of a basic RC or RL filter isdB per decade.
True
False
Q.10
In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is
0 Hz to 3.5 kHz
0 Hz
3.5 kHz
7 kHz
Q.11
A sinusoidal voltage with a peak-to-peak value ofV is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is
18 V peak-to-peak
Zero
9 V peak-to-peak
12.74 V peak-to-peak
Q.12
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
18 V peak-to-peak
Zero
9 V peak-to-peak
12.73 V peak-to-peak
Q.13
An RC high-pass filter consists of anΩ resistor. What is the value of C so that Xc is ten times less than Rat an input frequency ofkHz?
81 µF
161 µF
0.161 µF
220 µF
Q.14
A band-pass filter rejects all frequencies within a band between a lower and an upper critical frequency and passes all others.
True
False
Q.15
Critical frequencies are also called -3 dB frequencies.
True
False
Q.16
In a series resonant band-pass filter, a lower value of Q results in
A higher resonant frequency
A smaller bandwidth
A higher impedance
A larger bandwidth
Q.17
A series resonant band-stop filter consists of aΩ resistor, amH coil, and a 0.µF capacitor. The internal resistance, RW, of the coil is 4 Ω. Input voltage ismV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0?
1.1 mV
11.1 mV
111 mV
200 mV
Q.18
Vout =mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is
0 dB
8.30 dB
-8.30 dB
0.8 dB
Q.19
In a certain parallel resonant band-pass filter, the resonant frequency iskHz. If the bandwidth is 4 kHz, the lower frequency
Is 7 kHz
Is 10 kHz
Is 12 kHz
Cannot be determined
Q.20
A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.
True
False
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