Electrical Engineering - Passive Filters

Exercise :: Passive Filters - General Questions

16. 

An RC high-pass filter consists of an 820 resistor. What is the value of C so that Xc 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: Option C

Explanation:

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17. 

A series resonant band-stop filter consists of a 68 resistor, a 110 mH coil, and a 0.02 F capacitor. The internal resistance, RW, of the coil is 4 . 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

Answer: Option B

Explanation:

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18. 

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

A. 18 V peak-to-peak
B. zero
C. 9 V peak-to-peak
D. 12.74 V peak-to-peak

Answer: Option B

Explanation:

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19. 

Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is

A. 0 dB
B. 8.30 dB
C. –8.30 dB
D. 0.8 dB

Answer: Option C

Explanation:

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20. 

Referring to Problem 8, assume the input voltage is 15 V dc. What is the output voltage?

A. 0 V
B. 15 V
C. 7.07 V
D. 10.6 V

Answer: Option B

Explanation:

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