Single Phase AC Circuit Amplitude and Instantaneous Values
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Questions and Answers

In a pure inductive AC circuit, the current lags the voltage by how many degrees?

  • 270 degrees
  • 90 degrees (correct)
  • 180 degrees
  • 360 degrees
  • What is the role of a pure capacitor in an AC circuit?

  • Store electric power (correct)
  • Increase inductance
  • Reduce voltage
  • Generate resistance
  • What will be the maximum value of current in a circuit containing only a pure capacitor?

  • Im = Vm * R
  • Im = Vm * XC
  • Im = Vm / R
  • Im = Vm / XC (correct)
  • What is the impedance of an RC series circuit?

    <p>Z = R + Xc</p> Signup and view all the answers

    Which of the following statements is true about an RL series circuit?

    <p>Voltage across the resistor is equal to current</p> Signup and view all the answers

    What determines the total opposition to current flow in an RLC series circuit?

    <p>Impedance involving R, L, and C</p> Signup and view all the answers

    What does XC represent in an RC series circuit?

    <p>Capacitive inductance</p> Signup and view all the answers

    The current flowing through a pure inductive AC circuit will be maximum when sin(?t – p/2) equals:

    <p>1</p> Signup and view all the answers

    What happens to a capacitor when the supply is off?

    <p>It discharges</p> Signup and view all the answers

    How is the total voltage calculated in an RLC series circuit?

    <p>V = I*Z</p> Signup and view all the answers

    What is the instantaneous value of an AC signal?

    <p>The value at one specific moment in time</p> Signup and view all the answers

    In an AC circuit with only pure resistance, what happens to the phase difference between voltage and current?

    <p>There is no phase difference</p> Signup and view all the answers

    What is the formula for calculating the average voltage in an AC circuit?

    <p>Vavg = 0.636 Vmax</p> Signup and view all the answers

    What happens to the current in a purely inductive circuit when compared to the voltage?

    <p>Current lags behind the voltage by 90 degrees</p> Signup and view all the answers

    What is the phase angle when XL is greater than XC in an RLC series circuit?

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

    How is the RMS value of an AC wave calculated?

    <p>Square root of means of squares of instantaneous values</p> Signup and view all the answers

    In a purely resistive circuit, what happens to the power dissipation?

    <p>Dissipated by the resistors</p> Signup and view all the answers

    What happens to the power factor in an RLC series circuit when XL < XC?

    <p>It becomes leading</p> Signup and view all the answers

    What is the value of the peak voltage compared to the peak-to-peak voltage in an AC signal?

    <p>Peak value is half of peak-to-peak value</p> Signup and view all the answers

    What is the impedance of an RLC series circuit when XL = XC?

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

    Which type of AC waveform equals its average value to zero after a complete cycle?

    <p>Sinusoidal waveforms</p> Signup and view all the answers

    In an RLC series circuit, what type of circuit behavior results when XL < XC?

    <p>RC series circuit</p> Signup and view all the answers

    What is the total opposition offered to the flow of current in an RLC circuit called?

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

    What does the phase angle being zero between voltage and current represent in an AC circuit?

    <p>No power loss</p> Signup and view all the answers

    How are alternate current and voltage represented in a purely resistive AC circuit?

    <p>Move in the same direction</p> Signup and view all the answers

    What is the reactance of the resistor in the given RLC series circuit?

    <p>200 Ohms</p> Signup and view all the answers

    Which element voltage lags the current by 90 degrees in an RLC series circuit?

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

    What is the power factor of the given RLC series circuit?

    <p>0.563</p> Signup and view all the answers

    How does the circuit behave when XL > XC?

    <p>RL series circuit</p> Signup and view all the answers

    What is the term for the highest positive or negative value obtained by an alternating quantity in a single full cycle?

    <p>Peak value</p> Signup and view all the answers

    Which term refers to a collection of positive and negative values that completes one full cycle?

    <p>Full Cycle</p> Signup and view all the answers

    What happens to the phase angle in an RLC series circuit when XL = XC?

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

    What does the term 'Instantaneous value' represent in an AC circuit?

    <p>Current or voltage value at any given time</p> Signup and view all the answers

    How is frequency defined for an alternating quantity?

    <p>Number of cycles per second</p> Signup and view all the answers

    What is the waveform in an AC circuit?

    <p>Shape formed by alternating values</p> Signup and view all the answers

    What term refers to the time taken by a voltage or current to complete one cycle in an AC system?

    <p>Time period</p> Signup and view all the answers

    What is the peak-to-peak value in an AC signal?

    <p>Difference between peak values</p> Signup and view all the answers

    Which parameter is measured in hertz or cycle per second in an AC circuit?

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

    What represents the shape created by plotting alternating voltage or current values against time or angle in an AC system?

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

    Which term denotes the maximum values of voltage and current in an AC circuit?

    <p>Peak value</p> Signup and view all the answers

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