AC Fundamental MCQ

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AC Fundamentals - Circuits And Circuit Theory MCQ

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Multiple Choice Questions and Answers on AC Fundamentals, Circuits and Circuit Theory. Which of the following waves has the highest value of peak factor?

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    Question 1: For a sine wave with peak value Emax the average value is?

  • 1.414 Emax
  • 0.707 Emax
  • 0.636 Emax
  • 0.434 Emax

    • Answers: 0.636 Emax

    Question 2: A sine wave has a frequency of 60 Hz. Its angular frequency is ...... radian/second?

  • 100 ?
  • 25 ?
  • 5 ?
  • 50 ?

    • Answers: 100 ?

    Question 3: Skin effect occurs when a conductor carries current at ...... frequencies ?

  • medium
  • low
  • very low
  • high

    • Answers: high

    Question 4: The negative maximum of a cosine wave occurs at?

  • 90º
  • 180º
  • 30º
  • 45°

    • Answers: 180º

    Question 5: In a parallel R-C circuit, the current always ...... the applied voltage?

  • none of the above
  • lags
  • leads
  • remains in phase with

    • Answers: leads

    Question 6: Power factor of the following circuit will be zero?

  • resistance
  • inductance
  • capacitance
  • both (a) and (b)

    • Answers: both (a) and (b)

    Question 7: The EMS value of a sinusoidal A.C. current is equal to its value at an angle of ...... degrees?

  • 30
  • 45
  • 90
  • 60

    • Answers: 45

    Question 8: The frequency of an alternating current is?

  • the number of electrons passing through a point in one second
  • the speed with which the alternator runs
  • the number of waves passing through a point in one second
  • the number of cycles generated in one minute

    • Answers: the number of waves passing through a point in one second

    Question 9: Form Factor is the ratio of?

  • RMS value / average value
  • RMS value / peak value
  • average value / RMS value
  • average value / peak value

    • Answers: RMS value / average value

    Question 10: ln a series L-C circuit at the resonant frequency the?

  • voltage across C is minimum
  • current is minimum
  • impedance is maximum
  • current is maximum

    • Answers: current is maximum

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Total Questions Attempted: 0

Correct: 0 Wrong: 0

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