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The magnetic field energy in an inductor changes from maximum value to minimum value in \(5.0\) ms when connected to an AC source. The frequency of the source is:
1. \(20\) Hz
2. \(50\) Hz
3. \(200\) Hz
4. \(500\) Hz
Level 3: 35%-60%
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An inductor, a resistor and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance,
Choose the correct options:
| (a) | of the inductor increases. |
| (b) | of the resistor increases. |
| (c) | of the capacitor increases. |
| (d) | of the circuit increases. |
| 1. | (a) only | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Â Different Types of AC Circuits |
 61%
Level 2: 60%+
Hints
A transformer with \(8:1\) turns ratio has \(50~\text{Hz},\) \(100~\text V\) input. The frequency of the output is:
1. \(40~\text{Hz}\)
2. \(50~\text{Hz}\)
3. \(400~\text{Hz}\)
4. \(500~\text{Hz}\)
1. \(40~\text{Hz}\)
2. \(50~\text{Hz}\)
3. \(400~\text{Hz}\)
4. \(500~\text{Hz}\)
Subtopic: Â Transformer |
 78%
Level 2: 60%+
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Which of the following graphs best represents the variation of impedance \((Z)\) in an \(LCR\) series circuit as a function of the frequency \((f)\) of the applied AC source?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Different Types of AC Circuits |
 77%
Level 2: 60%+
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An AC supply is connected across a series \(LCR\) circuit. If the capacitor is removed, then which of the following phasor diagram may be correct for the remaining circuit?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Different Types of AC Circuits |
Level 3: 35%-60%
Hints
A current \(I=I_0\sin\Big(\omega t-\dfrac{\pi}{2}\Big),\) flows in an AC circuit across which an AC voltage \(E_0+E_0\sin\omega t\) has been applied. The average power \(P\) consumed in the circuit will be:
| 1. | \(\dfrac{E_0I_0}{\sqrt2}\) | 2. | \(\dfrac{E_0I_0}{2}\) |
| 3. | \(\sqrt2E_0I_0\) | 4. | zero |
Subtopic: Â Power factor |
 73%
Level 2: 60%+
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A transformer has an efficiency of \(80\text{%}.\) It works at \(40\) kW and \(100\) V. If the secondary voltage is \(240\) V, the current in the secondary coil is nearly:
1. \(40\) A
2. \(133.3\) A
3. \(86.7\) A
4. \(112\) A
1. \(40\) A
2. \(133.3\) A
3. \(86.7\) A
4. \(112\) A
Subtopic: Â Transformer |
 88%
Level 1: 80%+
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In the circuit shown below what will be the reading of the voltmeter \((V_1)\) and ammeter?
1. \(220\) V, \(2\) A
2. \(110\) V, \(2.4\) A
3. \(220\) V, \(2.4\) A
4. \(220\) V, \(1.1\) A
1. \(220\) V, \(2\) A
2. \(110\) V, \(2.4\) A
3. \(220\) V, \(2.4\) A
4. \(220\) V, \(1.1\) A
Subtopic: Â Different Types of AC Circuits |
 89%
Level 1: 80%+
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In which of the following circuits, maximum power dissipation is observed?
1. Pure resistive circuit
2. Pure capacitive circuit
3. Pure inductive circuit
4. None of the above
1. Pure resistive circuit
2. Pure capacitive circuit
3. Pure inductive circuit
4. None of the above
Subtopic: Â Power factor |
 87%
Level 1: 80%+
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An alternating voltage \(V=V_0\sin(\omega t)\) is applied across a circuit. As a result, a current \(I=I_0\sin\Big(\omega t+\dfrac{\pi}{2}\Big)\) flows in it. The power consumed per cycle is:
| 1. | \(\dfrac{V_0I_0}{2}\) | 2. | \(\dfrac{V_0I_0}{\sqrt2}\) |
| 3. | \(\sqrt2V_0I_0\) | 4. | zero |
Subtopic: Â Power factor |
 77%
Level 2: 60%+
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