Parallel AC Circuits: Impedance, Admittance and Resonance questions with solutions

Showing 1–10 of 28 questions

• Multi-correctmediumAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  An AC network draws the phasor current I = 6 - j8 A from a source whose phasor voltage is V = 100 + j0 V. Which statements are correct?

  Select all that apply

  • Option A

    The current magnitude is 10 A

  • Option B

    The power factor is 0.6

  • Option C

    The current lags the voltage

  • Option D

    The average power is 600 W

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• A/RmediumAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  Read the following assertion and reason and choose the correct option.

  Assertion

  Assertion (A): At ideal parallel resonance, the current drawn from the source can become minimum.

  Reason

  Reason (R): At resonance, the currents through the inductor and capacitor are in the same phase.

  Options

  • Option A

    Both A and R are true and R is the correct explanation of A.

  • Option B

    Both A and R are true but R is NOT the correct explanation of A.

  • Option C

    A is true but R is false.

  • Option D

    A is false but R is true.

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• NumericeasyAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  A load connected to a 200 V RMS source consumes 1600 W at a power factor of 0.8 lagging. Determine the RMS current drawn from the source in ampere.

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• NumericmediumAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  A 100 V RMS source is connected across three parallel branches containing R = 20 Ω, Xʟ = 25 Ω and Xᴄ = 50 Ω. If the total current is √N A, determine N.

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• MCQmediumAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  A 100 V RMS source is connected across an ideal inductor with Xʟ = 20 Ω and an ideal capacitor with Xᴄ = 25 Ω in parallel. Determine the magnitude and nature of the source current.

  Options

  • Option A

    1 A leading

  • Option B

    1 A lagging

  • Option C

    9 A leading

  • Option D

    9 A lagging

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• NumericeasyAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  A parallel RL circuit draws 10 A RMS at a power factor of 0.8 lagging. Determine the RMS current in the ideal inductor branch in ampere.

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• Multi-correctmediumAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  An ideal parallel LC circuit is connected to an AC source at its resonant frequency. Which statements are correct?

  Select all that apply

  • Option A

    The source current can ideally be zero

  • Option B

    The currents in L and C can individually be non-zero

  • Option C

    The equivalent impedance tends to infinity

  • Option D

    The average power consumed is maximum

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• MCQmediumAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  In a parallel RC circuit, the resistor branch carries 3 A RMS and the capacitor branch carries 4 A RMS. Determine the total current and the power factor.

  Options

  • Option A

    7 A and 3/7

  • Option B

    5 A and 3/5 leading

  • Option C

    5 A and 4/5 leading

  • Option D

    1 A and unity

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• MCQmediumAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  Two impedances Z₁ = 3 + j4 Ω and Z₂ = 3 - j4 Ω are connected in parallel. Determine their equivalent impedance.

  Options

  • Option A

    3 Ω

  • Option B

    25/6 Ω

  • Option C

    25/3 Ω

  • Option D

    6 Ω

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• Multi-correctmediumAC CircuitsParallel AC Circuits: Impedance, Admittance and Resonance

  A parallel RLC circuit is operated at a frequency for which the net reactive current is zero. Which statements are correct?

  Select all that apply

  • Option A

    The source current is in phase with the source voltage

  • Option B

    The overall power factor is unity

  • Option C

    The individual currents through L and C may be larger than the source current

  • Option D

    The source current must be zero

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