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Statements on current, impedance and power at resonance

This type of question, asked 5 times: 29 Jun 2022, 29 Jan 2023, 10 Apr 2023, 12 Apr 2023, 6 Apr 2024. All 5 questions below, oldest first.

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  1. Question 1

    29 Jun 2022

    10
    For a series LCR circuit, I vs ω\omega curve is shown: (A) To the left of ωr\omega_{r}, the circuit is mainly capacitive. (B) To the left of ωr\omega_{r}, the circuit is mainly inductive. (C) At ωr\omega_{r}, impedance of the circuit is equal to the resistance of the circuit. (D) At ωr\omega_{r}, impedance of the circuit is 0. Choose the most appropriate answer from the options given below:

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  2. Question 2

    29 Jan 2023

    102
    For the given figures, choose the correct options. Figure (a): a 40 Ω40\ \Omega resistor across a 220 V,50 Hz220\ V, 50\ Hz source. Figure (b): the same 40 Ω40\ \Omega resistor in series with a 50 mH50\ mH inductor and a 0.5 μF0.5\ \mu F capacitor across the same source.

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  3. Question 3

    10 Apr 2023

    12
    Given below are two statements: Statement I: Maximum power is dissipated in a circuit containing an inductor, a capacitor and a resistor connected in series with an ACAC source, when resonance occurs Statement II: Maximum power is dissipated in a circuit containing pure resistor due to zero phase difference between current and voltage. In the light of the above statements, choose the correct answer from the options given below:

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  4. Question 4

    12 Apr 2023

    20
    Given below are two statements: Statement I: When the frequency of an a.c. source in a series LCR circuit increases, the current in the circuit first increases, attains a maximum value and then decreases. Statement II: In a series LCR circuit, the value of power factor at resonance is one. In the light of given statements, choose the most appropriate answer from the options given below:

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  5. Question 5

    6 Apr 2024

    12
    Given below are two statements: Statement I: In an LCR series circuit, current is maximum at resonance. Statement II: Current in a purely resistive circuit can never be less than that in a series LCR circuit when connected to same voltage source. In the light of the above statements, choose the correct from the options given below:

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