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Q. No.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. \(500~\text{Hz}\)
Subtopic: Â Transformer |
 78%
From NCERT
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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%
From NCERT
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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 |
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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An alternating current in a circuit is given by; \(I=20\sin\left({{100}{\pi}{t}+{0.05}\pi}\right)~\text{A}\). The rms value and the frequency of the current respectively are:
1. \(10\) A and \(100\) Hz
2. \(10\) A and \(50\) Hz
3. \(10\sqrt{2}\) A and \(50\) Hz
4. \(10\sqrt{2}\) A and \(100\) Hz
1. \(10\) A and \(100\) Hz
2. \(10\) A and \(50\) Hz
3. \(10\sqrt{2}\) A and \(50\) Hz
4. \(10\sqrt{2}\) A and \(100\) Hz
Subtopic: Â RMS & Average Values |
 92%
From NCERT
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What reading would you expect of a square wave current, switching rapidly between \(+0.5~\text A\) and \(-0.5~\text A,\) when passed through an AC ammeter?
1. zero
2. \(0.5~\text A\)
3. \(0.25~\text A\)
4. \(1.0~\text A\)
1. zero
2. \(0.5~\text A\)
3. \(0.25~\text A\)
4. \(1.0~\text A\)
Subtopic: Â RMS & Average Values |
 52%
From NCERT
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