Alternating Current

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

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

Flashcards are hidden until you start studying

Related Documents

More Like This

Use Quizgecko on...
Browser
Browser