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Q. No.An ac source is connected to a capacitor \(C\). Due to decrease in its operating frequency:
| 1. | capacitive reactance remains constant | 2. | capacitive reactance decreases. |
| 3. | displacement current increases. | 4. | displacement current decreases. |
Subtopic: Different Types of AC Circuits |
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NEET - 2023
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A \(12~\text{V},60~\text{W}\) lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of \(220~\text{V}\). Assuming the transformer to be ideal, what is the current in the primary winding?
1. \(0.37 ~\mathrm{A}\)
2. \(0.27 ~\mathrm{A}\)
3. \(2.7 ~\mathrm{A}\)
4. \(3.7 ~\mathrm{A}\)
1. \(0.37 ~\mathrm{A}\)
2. \(0.27 ~\mathrm{A}\)
3. \(2.7 ~\mathrm{A}\)
4. \(3.7 ~\mathrm{A}\)
Subtopic: Transformer |
64%
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In a series \(\mathrm{LCR}\) circuit, the inductance \(\mathrm{L}\) is \(10\) mH, capacitance \(\mathrm{C}\) is \(1~\mathrm{\mu F}\) and resistance \(\mathrm{R}\) is \(100~\Omega\). The frequency at which resonance occurs is:
| 1. | \(1.59~\mathrm{kHz}\) | 2. | \(15.9~\mathrm{rad/s}\) |
| 3. | \(15.9~\mathrm{kHz}\) | 4. | \(1.59~\mathrm{rad/s}\) |
Subtopic: Different Types of AC Circuits |
56%
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The net impedance of circuit (as shown in the figure) will be:
1. \(25~\Omega\)
2. \(10\sqrt{2}~\Omega\)
3. \(15~\Omega\)
4. \(5\sqrt{5}~\Omega\)
1. \(25~\Omega\)
2. \(10\sqrt{2}~\Omega\)
3. \(15~\Omega\)
4. \(5\sqrt{5}~\Omega\)
Subtopic: Different Types of AC Circuits |
54%
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An ac source is connected to the given circuit. The value of \(\phi\) will be:
| 1. | \(60^\circ\) | 2. | \(90^\circ\) |
| 3. | \(30^\circ\) | 4. | \(45^\circ\) |
Subtopic: Different Types of AC Circuits |
62%
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If \(Z_1\) and \(Z_2\) are the impedances of the given circuits (a) and (b) as shown in figures, then choose the correct option:
| 1. | \(Z_1<Z_2\) | 2. | \(Z_1+Z_2=20~\Omega\) |
| 3. | \(Z_1=Z_2\) | 4. | \(Z_1>Z_2\) |
Subtopic: Different Types of AC Circuits |
59%
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The maximum power is dissipated for an ac in a/an:
| 1. | resistive circuit | 2. | \(\mathrm{LC}\) circuit |
| 3. | inductive circuit | 4. | capacitive circuit |
Subtopic: Different Types of AC Circuits |
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For very high frequencies, the effective impedance of the circuit (shown in the figure) will be:
1. \(4~ \Omega\)
2. \(6~ \Omega\)
3. \(1~ \Omega\)
4. \(3~ \Omega\)
1. \(4~ \Omega\)
2. \(6~ \Omega\)
3. \(1~ \Omega\)
4. \(3~ \Omega\)
Subtopic: Different Types of AC Circuits |
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The peak voltage of the ac source is equal to:
| 1. | \(1 / \sqrt{2}\) times the rms value of the ac source. |
| 2. | the value of voltage supplied to the circuit. |
| 3. | the rms value of the ac source. |
| 4. | \(\sqrt{2}\) times the rms value of the ac source. |
Subtopic: RMS & Average Values |
73%
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A series LCR circuit with inductance \(10~\mathrm{H}\), capacitance \(10~\mu F\), resistance \(50~\Omega\) is connected to an ac source of voltage, \(V=200 \sin (100 t) \text { volt }\). If the resonant frequency of the LCR circuit is \(\nu_0\) and the frequency of the ac source is \(\nu\), then:
| 1. | \(\nu=100 \mathrm{~Hz} ; ~\nu_0=\frac{100}{\pi} \mathrm{~Hz}\) |
| 2. | \(\nu_0=\nu=50 \mathrm{~Hz}\) |
| 3. | \(\nu_0=\nu=\frac{50}{\pi} \mathrm{Hz}\) |
| 4. | \(\nu_{0}=\frac{50}{\pi}~ \mathrm{Hz}, \nu=50 \mathrm{~Hz}\) |
Subtopic: Different Types of AC Circuits |
69%
From NCERT
NEET - 2022
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NEET 2021 - Achiever Batch - Aryan Raj Singh
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