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Q. No.In AC (alternating current) generator, a coil of wire rotates in a magnetic field.
Which of the following would change the potential difference measured by the voltmeter in the system above?
Which of the following would change the potential difference measured by the voltmeter in the system above?
| (a) | use more turns of wire in the coil. |
| (b) | use thicker wire. |
| (c) | change the speed of rotation. |
| 1. | (c) only |
| 2. | (a), (b) and (c) |
| 3. | (a) and (b) only |
| 4. | (a) and (c) only |
Subtopic: Â AC Generator |
 53%
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A series R-C circuit is connected to an alternating voltage source. Consider two situations
Current passing through the resistor is \(I\) and voltage drop on capacitor is \(V\). Then:
| (A) | When the capacitor is air filled. |
| (B) | When the capacitor is mica filled. |
| 1. | \(V_A>V_B\) |
| 2. | \(V_A<V_B\) |
| 3. | \(V_A=V_B\) |
| 4. | it can't be predicted. |
Subtopic: Â Different Types of AC Circuits |
 68%
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The plot of current \(i\) in \(LCR\) series circuit with the frequency \(f\) of the applied AC source is best represented by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Different Types of AC Circuits |
 70%
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Choose the correct statements regarding a series \(LCR\) circuit.
| 1. | voltage across the capacitor lags behind the current. |
| 2. | voltage across the inductor leads the current. |
| 3. | voltage across \(R\) is in phase with the current. |
| 4. | all of the above. |
Subtopic: Â Different Types of AC Circuits |
 88%
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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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The variation of an alternating current \(I=I_0 \mathrm{sin}(\omega t)\) with time \((t)\) is shown in the figure below. The average value of current for the half-cycle will be:
1. \(\frac{I_{0}}{\pi}\)
2. \(\frac{I_{0}}{2}\)
3. \(\frac{2 I_{0}}{\pi}\)
4. \(\frac{I_{0}}{2 \pi}\)
1. \(\frac{I_{0}}{\pi}\)
2. \(\frac{I_{0}}{2}\)
3. \(\frac{2 I_{0}}{\pi}\)
4. \(\frac{I_{0}}{2 \pi}\)
Subtopic: Â RMS & Average Values |
 65%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | A glowing bulb becomes dim when an iron bar is put in the inductor in series LR ac circuit. |
| Reason (R): | Resistance of circuit increases. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Different Types of AC Circuits |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | When ac circuit contains resistor only, its power is minimum. |
| Reason (R): | Power of a circuit is independent of phase angle. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Power factor |
 72%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | A transformer cannot work on a steady DC supply. |
| Reason (R): | Steady DC changes neither in magnitude nor in direction. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Transformer |
 77%
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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 |
 69%
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