AC Fundamental MCQ

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AC Fundamentals | Interview MCQ | AC Power Fundamentals Module

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Alternating Current, Circuits, AC: Certain circuits include sources of alternating electromotive forces of the sinusoidal form V = V0 cos(ωt). alternating current (AC), how it works, basic AC source and AC generators, difference between AC.

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    Question 1: A parallel resonant circuit can be used?

  • to amplify certain frequencies
  • to reject a small band of frequencies
  • both (a) and (b)
  • as a high impedance

    • Answers: both (a) and (b)

    Question 2: Higher the Q of a series circuit?

  • narrower its pass band
  • sharper its resonance
  • broader its resonance curve
  • greater its bandwidth

    • Answers: narrower its pass band

    Question 3: Time constant of a capacitive circuit increases with the?

  • decrease of capacitance and decrease of resistance
  • decrease of capacitance and increase of resistance
  • increase of capacitance and decrease of resistance
  • increase of capacitance and increase of resistance

    • Answers: increase of capacitance and increase of resistance

    Question 4: For a sine wave with peak value Imax the RMS value is?

  • 1.414 Imax
  • 0.707 Imax
  • 0.5 Imax
  • 0.9 Imax

    • Answers: 0.707 Imax

    Question 5: The form factor is the ratio of?

  • average value to RMS value
  • none of the above
  • RMS value to average value
  • peak value to RMS value

    • Answers: RMS value to average value

    Question 6: At ...... frequencies the parallel R-L circuit behaves as purely resistive?

  • high
  • very low
  • low
  • very high

    • Answers: very high

    Question 7: To neglect a current source, the terminals across the source are?

  • replaced by source resistance
  • open-circuited
  • replaced by capacitance
  • short-circuited

    • Answers: open-circuited

    Question 8: In a pure inductive circuit?

  • the current can lead or lag by 90º
  • the current is in phase with the voltage
  • the current lags behind the voltage by 90º
  • the current leads the voltage by 90º

    • Answers: the current lags behind the voltage by 90º

    Question 9: In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value ?

  • will increase the selectivity of the circuit
  • will change the maximum value of current at resonance
  • will change the impedance at resonance frequency
  • will change the resonance frequency

    • Answers: will increase the selectivity of the circuit

    Question 10: Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

  • none of the above
  • either (c) or (d)
  • series
  • parallel

    • Answers: parallel

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Total Questions Attempted: 0

Correct: 0 Wrong: 0

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