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MCQs

Total Questions : 65 | Page 2 of 7 pages
Question 11. If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
  1.    Disappears
  2.    Becomes sharper
  3.    Increases
  4.    Decreases
 Discuss Question
Answer: Option D. -> Decreases
Question 12. A 200 Ω resistor, a coil with 30 Ω of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance is
  1.    230 Ω
  2.    170 Ω
  3.    200 Ω
  4.    Cannot be determined
 Discuss Question
Answer: Option C. -> 200 Ω
Question 13. If the value of C in a series RLC circuit is decreased, the resonant frequency
  1.    Is not affected
  2.    Increases
  3.    Is reduced to zero
  4.    Decreases
 Discuss Question
Answer: Option B. -> Increases
Question 14. A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 Ω, C = 80 µF, and L = 10 mH. The total impedance, expressed in polar form, is
  1.    12.28 ∠12.34° Ω
  2.    12.57 ∠12.34° Ω
  3.    9.95 ∠12.34° Ω
  4.    12.62 ∠12.34° Ω
 Discuss Question
Answer: Option A. -> 12.28 ∠12.34° Ω
Question 15. In a series RLC circuit that is operating above the resonant frequency, the current
  1.    Lags the applied voltage
  2.    Leads the applied voltage
  3.    Is in phase with the applied voltage
  4.    Is zero
 Discuss Question
Answer: Option A. -> Lags the applied voltage
Question 16. A 12 Ω resistor, a 40 µF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is
  1.    28.1 Hz
  2.    281 Hz
  3.    2,810 Hz
  4.    10 kHz
 Discuss Question
Answer: Option B. -> 281 Hz
Question 17. In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is
  1.    125 V
  2.    250 V
  3.    290 V
  4.    40 V
 Discuss Question
Answer: Option D. -> 40 V
Question 18. A resistor of 3 kΩ, a 0.05 µF capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?
  1.    636 Ω
  2.    3,769 Ω
  3.    433 Ω
  4.    4,337 Ω
 Discuss Question
Answer: Option D. -> 4,337 Ω
Question 19. A 15 Ω resistor, a 220 µH coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?
  1.    138 MHz
  2.    10,866 Hz
  3.    1,907 Hz
  4.    138 kHz
 Discuss Question
Answer: Option B. -> 10,866 Hz
Question 20. A series resonant circuit is commonly called a tank circuit.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False

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