Parallel and Mixed AC Circuits questions with solutions

Showing 1–10 of 23 questions

• A/RmediumAC CircuitsParallel and Mixed AC Circuits

  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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• Multi-correctmediumAC CircuitsParallel and Mixed AC Circuits

  Two parallel branches have impedances Z₁ = 3 + j4 Ω and Z₂ = 3 - j4 Ω. Which statements are correct?

  Select all that apply

  • Option A

    The equivalent impedance is purely resistive

  • Option B

    The source current is in phase with the source voltage

  • Option C

    The reactive powers of the two branches cancel

  • Option D

    The two branch-current phasors are identical

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• MCQmediumAC CircuitsParallel and Mixed AC Circuits

  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 and Mixed AC Circuits

  A parallel AC circuit has an in-phase current component of 8 A and a leading reactive current component of 6 A. Determine the total current and the power factor.

  Options

  • Option A

    14 A and 4/7

  • Option B

    10 A and 0.8 leading

  • Option C

    10 A and 0.6 leading

  • Option D

    2 A and unity

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• A/RmediumAC CircuitsParallel and Mixed AC Circuits

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

  Assertion

  Assertion (A): The source current in a parallel RC circuit leads the source voltage.

  Reason

  Reason (R): The capacitor branch current leads the voltage by 90°, while the resistor branch current is in phase with the voltage.

  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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• MCQmediumAC CircuitsParallel and Mixed AC Circuits

  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 and Mixed AC Circuits

  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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• Multi-correctmediumAC CircuitsParallel and Mixed AC Circuits

  A resistor R and a capacitor C are connected in parallel across the same sinusoidal AC source. Which statements are correct?

  Select all that apply

  • Option A

    The resistor current is in phase with the source voltage

  • Option B

    The capacitor current leads the source voltage by 90°

  • Option C

    The total source current leads the source voltage

  • Option D

    The equivalent impedance must be purely real

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• NumericmediumAC CircuitsParallel and Mixed AC Circuits

  A branch consisting of R = 10 Ω in series with Xʟ = 10 Ω is connected in parallel with a 20 Ω resistor. The combination is connected across 100 V RMS. If the total average power is 100N W, determine N.

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• Multi-correctmediumAC CircuitsParallel and Mixed AC Circuits

  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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