Ac Cirucuits questions with solutions

Showing 1–10 of 44 questions

• MCQmediumAc Cirucuitsavg value and rms value of ac

  An AC voltage V = 20 sin 200πt is applied to a series LCR circuit which drives a current I = 10 sin(200πt + π/3). The average power dissipated is:

  Options

  • Option A

    21.6 W

  • Option B

    200 W

  • Option C

    173.2 W

  • Option D

    50 W

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  JEE Mains 2024 31 Jan Evening Shift

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• MCQmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  An alternating voltage V(t) = 220 sin 100πt volt is applied to a purely resistive load of 50 Ω. The time taken for the current to rise from half of the peak value to the peak value is:

  Options

  • Option A

    5 ms

  • Option B

    3.3 ms

  • Option C

    7.2 ms

  • Option D

    2.2 ms

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  JEE Mains 2024 30 Jan Evening Shift

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• NumericmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  An inductor of self-inductance 1 H is connected in series with a resistor of 100π Ω across an AC supply of 100π V (rms) and frequency 50 Hz. Find the maximum current in ampere.

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  JEE Mains 2025 4 April Evening Shift

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• MCQeasyAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  A LCR circuit is at resonance for a capacitor C, inductance L and resistance R. Now the value of resistance is halved keeping all other parameters same. The current amplitude at resonance will be now:

  Options

  • Option A

    Zero

  • Option B

    double

  • Option C

    same

  • Option D

    halved

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  JEE Mains 2024 08 Apr Morning Shift

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• MCQmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  A series L,R circuit connected with an ac source E = (25 sin 1000 t) V has a power factor of 1/√2. If the source of emf is changed to E = (20 sin 2000 t)V, the new power factor of the circuit will be :

  Options

  • Option A

    1/√2

  • Option B

    1/√3

  • Option C

    1/√5

  • Option D

    1/√7

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  JEE Mains 2024 30 Jan Morning Shift

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• NumericmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  A series LCR circuit is connected to an AC source of 220 V, 50 Hz. The circuit contains a resistance R = 80 Ω, an inductor of inductive reactance X(L) = 70 Ω, and a capacitor of capacitive reactance X(C) = 130 Ω. The power factor of circuit is x/10. The value of x is :

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  JEE Mains25 January 2023Shift 2Evening Shift

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• MCQmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  A coil of negligible resistance is connected in series with 90 Ω resistor across 120 V, 60 Hz supply. A voltmeter reads 36 V across resistance. Inductance of the coil is:

  Options

  • Option A

    0.76 H

  • Option B

    2.86 H

  • Option C

    0.286 H

  • Option D

    0.91 H

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  JEE Mains 2024 08 Apr Evening Shift

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• MCQeasyAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  In a series LCR circuit, the capacitance is changed from C to 4C. To keep the resonance frequency unchanged, the new inductance should be:

  Options

  • Option A

    reduced by L/4

  • Option B

    increased by 2L

  • Option C

    reduced by 3L/4

  • Option D

    increased to 4L

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  JEE Mains 2024 01 Feb Morning Shift

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• NumericmediumAc Cirucuitsavg value and rms value of ac

  An alternating current at any instant is given by i = [6 + √56 sin(100πt + π/3)] A. The rms value of the current is ______ A.

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  JEE Mains 2024 04 Apr Morning Shift

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• MCQmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  In a series LCR circuit, L=100 mH and C=1 nF. The angular frequency at which current amplitude is maximum is:

  Options

  • Option A

    10⁴/(2π) rad s⁻¹

  • Option B

    10⁵/(2π) rad s⁻¹

  • Option C

    10⁵ rad s⁻¹

  • Option D

    10⁶ rad s⁻¹

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  JEE Mains 2025 23 Jan Evening Shift

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