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MCQs

Total Questions : 65 | Page 1 of 7 pages
Question 1. A lower Q produces a narrower bandwidth.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 2. A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will
  1.    Increase
  2.    Remain the same
  3.    Decrease
  4.    Be less selective
 Discuss Question
Answer: Option C. -> Decrease
Question 3. A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 µF capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, RW, is 30 Ω. The equivalent parallel resistance, Rp(eq), is
  1.    1,878 Ω
  2.    18,780 Ω
  3.    18,750 Ω
  4.    626 Ω
 Discuss Question
Answer: Option B. -> 18,780 Ω
Question 4. The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 µF, and RW = 90 Ω is
  1.    0 Ω
  2.    90 Ω
  3.    20 Ω
  4.    40 Ω
 Discuss Question
Answer: Option B. -> 90 Ω
Question 5. In a parallel RLC circuit, the smaller reactance determines the net reactance of the circuit.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 6. In a series RLC circuit, the larger reactance determines the net reactance of the circuit.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 7. To tune a parallel resonant circuit to a higher frequency, the capacitance should be
  1.    Increased
  2.    Decreased
  3.    Left alone
  4.    Replaced with inductance
 Discuss Question
Answer: Option B. -> Decreased
Question 8. The reactive voltages, VL and VC, cancel at resonance.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 9. A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is
  1.    12.7 Ω
  2.    127 Ω
  3.    4,436 Ω
  4.    6,174 Ω
 Discuss Question
Answer: Option A. -> 12.7 Ω
Question 10. A 9 mH coil is in parallel with a 0.015 µF capacitor across an 18 kHz ac source. The coil's internal resistance RW, is 60 Ω. The circuit impedance is
  1.    17,340 Ω
  2.    1,734 Ω
  3.    290 Ω
  4.    1,018 Ω
 Discuss Question
Answer: Option A. -> 17,340 Ω

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