Quiz  /  Rlc Circuit MCQ

  • 1. 
    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

  • 1,878 Ω
  • 18,780 Ω
  • 18,750 Ω
  • 626 Ω

  • 2. 
    A 15 kΩ resistor, a 220 μH coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?

  • 138 MHz
  • 10,866 Hz
  • 1,907 Hz
  • 138 kHz

  • 3. 
    A 90 Ω resistor, a coil with 30 Ω of reactance, and a capacitor with 50 Ω of reactance are in series across a 12 V ac source. The current through the resistor is

  • 9 mA
  • 90 mA
  • 13 mA
  • 130 mA

  • 4. 
    The total impedance, expressed in polar form for 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 is

  • 12.28 ㄥ12.34
  • Ω
  • 12.57 ㄥ12.34
  • Ω
  • 9.95 ㄥ12.34
  • Ω
  • 12.62 ㄥ12.34
  • Ω

  • 5. 
    If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth

  • Disappears
  • Becomes Sharper
  • Increases
  • Decreases

  • 6. 
    To tune a parallel resonant circuit to a higher frequency, the capacitance should be

  • Increased
  • Decreased
  • Left alone
  • Replaced with inductance

  • 7. 
    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.

  • 12.7 Ω
  • 127 Ω
  • 4.436 Ω
  • 6,174 Ω

  • 8. 
    What is the value of resonant frequency if the value of C in a series RLC circuit is decreased?

  • Is not affected
  • Increases
  • Is reduced to zero
  • Decreases

  • 9. 
    In a series RLC circuit that is operating above the resonant frequency the current

  • Lags the applied voltage
  • Leads the applied voltage
  • Is in phase with the applied voltage
  • Is zero

  • 10. 
    An inductor with a reactance of 120 Ω, a capacitor with a reactance of 120 Ω and a 24 Ω resistor are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is

  • 60 V
  • 660 V
  • 30 V
  • 300 V
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