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Q. No.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 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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A transformer operating at a primary voltage of \(8\) kV and secondary voltage of \(160\) V serves a load of \(80\) kW. Assuming the transformer to be ideal with purely resistive load and working on unity power factor, the loads in the primary and secondary circuit would be:
| 1. | \(800~\Omega\) and \(1.06~\Omega\) | 2. | \(10~\Omega\) and \(500~\Omega\) |
| 3. | \(800~\Omega\) and \(0.32~\Omega\) | 4. | \(1.06~\Omega\) and \(500~\Omega\) |
Subtopic: Â Transformer |
 80%
Level 1: 80%+
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At a hydroelectric power plant, the water pressure head is at a height of \(300\) m and the water flow available is \(100\) m3 s-1. If the turbine generator efficiency is \(60\)%, the electric power available from the plant is:
(Take \(g=9.8\) m s-2)
1. \(111.3\) MW
2. \(210\) MW
3. \(176.4\) MW
4. \(213.5\) MW
Subtopic: Â AC Generator |
 70%
Level 2: 60%+
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Given below are two statements:
| Statement I: | In an AC circuit, the current through a capacitor leads the voltage across it. |
| Statement II: | In AC circuits containing pure capacitance only, the phase difference between the current and the voltage is \(\pi.\) |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct but Statement II is incorrect. |
| 4. | Statement I is incorrect but Statement II is correct. |
Subtopic: Â Different Types of AC Circuits |
 72%
Level 2: 60%+
NEET - 2022
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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%
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%+
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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%
Level 2: 60%+
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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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At an airport, a person is made to walk through the doorway of a metal detector, for security reasons. If she/he is carrying anything made of metal, the metal detector emits a sound. On what principle does this detector work?
| 1. | resonance in AC circuits |
| 2. | logic gate |
| 3. | x-rays |
| 4. | none of the above |
 85%
Level 1: 80%+
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