Chapter 15: Single-phase Series A.C. Circuits
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Questions and Answers

In a circuit with a 40 µF capacitor in series with a coil of resistance 8 Ω and inductance 80 mH connected to a 200 V, 100 Hz supply, what is the circuit impedance?

  • 10 Ω
  • 25 Ω
  • 15 Ω (correct)
  • 20 Ω
  • What is the phase angle between voltage and current in an R-L-C series circuit if X_L = X_C?

  • 45 degrees
  • 180 degrees
  • 0 degrees (correct)
  • 90 degrees
  • When X_L = X_C in an R-L-C series circuit, what is the relationship between the applied voltage V and the current I?

  • V L = I
  • V L < V C
  • V L > V C
  • V L = V C (correct)
  • What is the formula to calculate the resonant frequency fr in an R-L-C series circuit?

    <p>$\frac{1}{2π\sqrt{LC}}$</p> Signup and view all the answers

    What is the maximum current possible in an R-L-C series circuit at resonance?

    <p>$I = \frac{V}{R}$</p> Signup and view all the answers

    If three impedances are connected in series across a 100 V, 2 kHz supply, what is the total impedance of the circuit?

    <p>$200\ Ω$</p> Signup and view all the answers

    What happens to the circuit impedance when the resistance in an R-L-C series circuit increases?

    <p>Impedance increases</p> Signup and view all the answers

    How does the phase angle change as the frequency of the supply in an R-L-C series circuit deviates from resonance?

    <p>The phase angle increases</p> Signup and view all the answers

    What happens to the voltage across the coil when X_L > X_C in an R-L-C series circuit?

    <p>$V_L &gt; V_C$</p> Signup and view all the answers

    $R$ and $L$ values in an R-L-C series circuit are adjusted such that $X_L = X_C$. What is the value of the circuit phase angle?

    <p>$0$ degrees</p> Signup and view all the answers

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