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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 V<sub>rms</sub>. What is the output voltage magnitude at the center frequency (f<sub>0</sub>)?
A
10.9 V
B
1.09 V
C
1.1 V
D
12 V
Correct Answer:
10.9 V
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
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
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
A rotary drum filter with 30% submergence is used to filter concentrated aqueous slurry of calcium carbonate containing 15lb of solids per cubic foot of water. The pressure–drop is 2011Hg. If the filter cake contains 50% mixture (wet basis), calculate the filter area required to filter 10 gal/min of slurry. The filter cycle time is 5 min. The specific cake resistance depends on the pressure–drop as: α (ft/lb) = α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance.
A
≅ 88 ft2
B
= α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance. a) ≅ 88 ft2 [ ≅ 86 ft2
C
≅ 82 ft2
D
≅ 90 ft2
An RC low-pass filter consists of a 120 Ω resistor and a 0.002 µF capacitor. The output is taken across the capacitor. The circuit's critical frequency is
A
333 kHz
B
633 kHz
C
331 kHz
D
60 kHz
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
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
In a clapp oscillator with three capacitor C1, C2, C3, C1 is used as upper capacitor in voltage divider, C2 is used as lower capacitor in voltage divider and C3 is the third capacitor. For perfect operation which of these capacitor should have minimum value?
A
C1
B
C2
C
C3
D
All of them are equal
An RL high-pass filter consists of a 470 Ω resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is
A
125 Hz
B
1,250 Hz
C
564 Hz
D
5,644 Hz
A 12 Ω resistor, a 40 µF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is
A
28.1 Hz
B
281 Hz
C
2,810 Hz
D
10 kHz