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 (C)</p> Signup and view all the answers

What is a choke coil?

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

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

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

What is the quality factor of a circuit dependent on?

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

What is the impedance of a circuit at resonance?

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

What is a choke coil?

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

What is the power factor of an ideal choke coil?

<p>0 (B)</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 (A)</p> Signup and view all the answers

What is the inductive reactance of a choke coil?

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

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

<p>X_L = X_C (D)</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 (C)</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 (A)</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 (D)</p> Signup and view all the answers

What is the application of series RLC circuits in telegraphy?

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

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

<p>ω = 2πν (B)</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 (B)</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 (D)</p> Signup and view all the answers

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

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

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

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

What is the unit of impedance?

<p>Ohm (C)</p> Signup and view all the answers

What is the relationship between reactance and frequency?

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

What is the quality factor of a circuit dependent on?

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

What is the significance of the reciprocal of impedance?

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

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Related Documents

NEET Physics Notes - Chapter 24 - Alternating Current PDF

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