AC Circuits questions with solutions

Showing 1–10 of 254 questions

• NumericmediumAC Circuits

  In the shown circuit, let k=i₁/i₂, where i₁ is the battery current at t=0 and i₂ is the steady

  

  -state battery current at t→∞. Find 100k.

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• MCQmediumAC Circuits

  An ideal transformer has primary input power 10 kW. The secondary current is 25 A and the primary: secondary turns ratio is 8:1. The primary voltage is:

  Options

  • Option A

    10⁴×8²/25 V

  • Option B

    10⁴×8/25 V

  • Option C

    10⁴/(25×8) V

  • Option D

    10⁴/(25×8²) V

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• NumericmediumAC CircuitsAverage Value, RMS Value, Power and AC Instruments

  The current through a conductor is i = 3 + 4 sinωt + 12 cos2ωt A. If the square of its RMS value is N A², determine N.

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• MCQmediumAC Circuits

  An AC source V=V₀(sinωt+sin3ωt) is connected in series with R and C. The current is i=i₁sin(ωt+φ₁)+i₂sin(3ωt+φ₂). Then:

  Options

  • Option A

    i₁>i₂

  • Option B

    i₁=i₂

  • Option C

    i₁<i₂

  • Option D

    Any of the above may be true

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• MCQmediumAC Circuits

  When 100 V DC is applied across a solenoid a current of 1 A flows in it. When 100 V AC is applied across the same coil, the current drops to 0.5 A. If the frequency of the AC source is 50 Hz, the impedance and inductance of the solenoid are:

  Options

  • Option A

    100Ω, 0.93 H

  • Option B

    200Ω, 1.0 H

  • Option C

    10Ω, 0.86H

  • Option D

    200Ω, 0.55 H

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• A/RmediumAC CircuitsAverage Value, RMS Value, Power and AC Instruments

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

  Assertion

  Assertion (A): A hot-wire instrument can measure both alternating current and direct current.

  Reason

  Reason (R): Its deflection depends on the heating effect produced by the current, which is proportional to the mean value of i².

  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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• 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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• MCQeasyAC Circuitsseries combination of ac circuit and L-C-R circuit

  A series LCR circuit is subjected to an AC signal of 200 V, 50 Hz. If the voltage across the inductor (L = 10 mH) is 31.4 V, then the current in this circuit is ________ :

  Options

  • Option A

    68 A

  • Option B

    63 A

  • Option C

    10 A

  • Option D

    10 mA

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• MCQmediumAC Circuits

  For a series RLC circuit driven at resonance angular frequency ω₀, the quality factor Q is:

  Options

  • Option A

    ω₀R/L

  • Option B

    R/(ω₀C)

  • Option C

    CR/ω₀

  • Option D

    ω₀L/R

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• MCQmediumAC Circuits

  In a series R-L-C circuit, the frequency of the source is half of the resonance frequency. The nature of the circuit will be

  Options

  • Option A

    capacitive

  • Option B

    inductive

  • Option C

    purely resistive

  • Option D

    data insufficient

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