Passive Filters(Electrical Engineering ) Questions and Answers

Question 1. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency
  1.    Is 7 kHz
  2.    Is 10 kHz
  3.    Is 12 kHz
  4.    Cannot be determined
Explanation:-
Answer: Option C. -> Is 12 kHz
Question 2. The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 3. A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 4. 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?
  1.    1.1 mV
  2.    11.1 mV
  3.    111 mV
  4.    200 mV
Explanation:-
Answer: Option B. -> 11.1 mV
Question 5. Vout = 500 mV and Vin = 1.3 V. The ratio $$\frac{{{{\text{V}}_{{\text{out}}}}}}{{{{\text{V}}_{{\text{in}}}}}}\,$$ expressed in dB is
  1.    0 dB
  2.    8.30 dB
  3.    -8.30 dB
  4.    0.8 dB
Explanation:-
Answer: Option C. -> -8.30 dB
Question 6. 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
  1.    18 V peak-to-peak
  2.    Zero
  3.    9 V peak-to-peak
  4.    12.73 V peak-to-peak
Explanation:-
Answer: Option A. -> 18 V peak-to-peak
Question 7. 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
Explanation:-
Answer: Option A. -> 10.9 V
Question 8. The roll-off rate of a basic RC or RL filter is 20 dB per decade.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 9. 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
Explanation:-
Answer: Option A. -> 0 Hz to 3.5 kHz
Question 10. 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
Explanation:-
Answer: Option B. -> Zero
© Lakshya_Education.com, All Right Reserved.
Contact Us services