Alternating Current
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Questions and Answers

What is the current that does not contribute to the average power dissipation in an AC circuit?

  • Wattless current (correct)
  • Reactive current
  • Resistive current
  • Active current

    • What is the condition for resonance in a parallel LC circuit?

  • XL = 0
  • XL = XC (correct)
  • XC = 2XL
  • XL = 2XC

    • What is the quality factor of a circuit equivalent to at resonance?

  • Voltage amplification
  • Current amplification (correct)
  • Impedance amplification
  • Power amplification

    • What is the impedance of a circuit at resonance?

    <p>Infinite</p> Signup and view all the answers

    What is a choke coil?

    <p>A device with high inductance and low resistance</p> Signup and view all the answers

    What is the condition of resonance in a parallel RLC circuit?

    <p>XL = XC</p> Signup and view all the answers

    What is the average value of the wattless component over one cycle in an AC circuit?

    <p>Zero</p> Signup and view all the answers

    What is the quality factor of a circuit dependent on?

    <p>Resistance, inductance, and capacitance</p> Signup and view all the answers

    What is the impedance of a circuit at resonance?

    <p>Equal to R</p> Signup and view all the answers

    What is a choke coil?

    <p>A type of inductor</p> Signup and view all the answers

    What is the condition for parallel resonance in a circuit containing a choke coil?

    <p>R &lt; LC</p> Signup and view all the answers

    What is the power factor of an ideal choke coil?

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

    Why is a soft iron core used in a choke coil?

    <p>To improve the inductance of the circuit</p> Signup and view all the answers

    What is the inductive reactance of a choke coil?

    <p>XL = 2πνL</p> Signup and view all the answers

    What determines the frequency of AC produced by a generator?

    <p>Number of poles and rotational frequency of the coil</p> Signup and view all the answers

    What is the condition for resonance in a series RLC circuit?

    <p>X_L = X_C</p> Signup and view all the answers

    What is the significance of the quality factor Q in a circuit?

    <p>It determines the bandwidth of the circuit</p> Signup and view all the answers

    What is the significance of the phasor diagram in AC circuits?

    <p>It helps to determine the phase difference between voltage and current</p> Signup and view all the answers

    What is the significance of impedance in a series RLC circuit?

    <p>It determines the resonance frequency of the circuit</p> Signup and view all the answers

    What is the application of series RLC circuits in telegraphy?

    <p>In selector circuits</p> Signup and view all the answers

    What is the expression for the angular frequency of an alternating quantity?

    <p>ω = 2πν</p> Signup and view all the answers

    What is the significance of the peak value of an alternating quantity?

    <p>It is the maximum value of the quantity</p> Signup and view all the answers

    What is the relationship between the rms value and the peak value of an alternating quantity?

    <p>irms = i0/0.707</p> Signup and view all the answers

    What is the unit of the angular frequency of an alternating quantity?

    <p>radians per second</p> Signup and view all the answers

    What is the expression for the instantaneous value of an alternating current?

    <p>i = i0 sin ωt</p> Signup and view all the answers

    What is the unit of impedance?

    <p>Ohm</p> Signup and view all the answers

    What is the relationship between reactance and frequency?

    <p>Reactance is directly proportional to frequency</p> Signup and view all the answers

    What is the significance of a phasor diagram?

    <p>It represents the voltage and current vectors of an AC circuit</p> Signup and view all the answers

    What is the quality factor of a circuit dependent on?

    <p>The inductance and capacitance</p> Signup and view all the answers

    What is the significance of the reciprocal of impedance?

    <p>It is the admittance of a circuit</p> Signup and view all the answers

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