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MCQs

Total Questions : 25 | Page 2 of 3 pages
Question 11. 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
  1.    18 V peak-to-peak
  2.    Zero
  3.    9 V peak-to-peak
  4.    12.74 V peak-to-peak
 Discuss Question
Answer: Option B. -> Zero
Question 12. In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is
  1.    0 Hz to 3.5 kHz
  2.    0 Hz
  3.    3.5 kHz
  4.    7 kHz
 Discuss Question
Answer: Option A. -> 0 Hz to 3.5 kHz
Question 13. The roll-off rate of a basic RC or RL filter is 20 dB per decade.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 14. 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 Vrms. What is the output voltage magnitude at the center frequency (f0)?
  1.    10.9 V
  2.    1.09 V
  3.    1.1 V
  4.    12 V
 Discuss Question
Answer: Option A. -> 10.9 V
Question 15. In an RC high-pass filter, the output is taken across the resistor and the output leads the input.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 16. In an RL high-pass filter, the output is taken across the inductor and the output leads the input.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 17. At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is
  1.    6.02 dB
  2.    -6.02 dB
  3.    12.04 dB
  4.    -12.04 dB
 Discuss Question
Answer: Option B. -> -6.02 dB
Question 18. 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
  1.    333 kHz
  2.    633 kHz
  3.    331 kHz
  4.    60 kHz
 Discuss Question
Answer: Option B. -> 633 kHz
Question 19. The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is
  1.    0 V
  2.    15 V
  3.    10.60 V
  4.    21.21 V
 Discuss Question
Answer: Option C. -> 10.60 V
Question 20. 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
  1.    93.8 kHz
  2.    93.8 Hz
  3.    861 Hz
  4.    86.12 kHz
 Discuss Question
Answer: Option A. -> 93.8 kHz

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