Passive Filters

An RC high-pass filter consists of an 820

resistor. What is the value of C so that X_c is ten times less than R at an input frequency of 12 kHz?

A:

81

F

B:

161

F

C:

0.161

F

D:

220

F

Answer: C

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In a certain low-pass filter, f_c = 3.5 kHz. Its passband is

A:

0 Hz to 3.5 kHz

B:

0 Hz

C:

3.5 kHz

D:

7 kHz

Answer: A

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Referring to Problem 15, if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?

A:

6 V

B:

597 mV

C:

5.97 V

D:

0 V

Answer: C

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An RC low-pass filter consists of a 120

resistor and a 0.002

F 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

Answer: B

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A series resonant band-pass filter consists of a 2 mH coil, a 0.005

F capacitor, and a 120

resistor. The winding resistance of the coil is 12

. The output voltage is taken off the resistor. Input voltage is 12 V_rms. 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

Answer: A

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Questions for: Passive Filters