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Q. No.LCR series circuit is connected with an alternating emf source. If the peak current and voltage are respectively then at resonance the value of wattless current is
Subtopic: Different Types of AC Circuits |
62%
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The value of quality factor ( Q-value) of the series resonant circuit with inductance L = 2.0 H, capacitance C= 32 and resistance R = 10 , is
1. 25
2. 250
3. 0.25
4. 2.5
76%
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Given below are two statements.
| Assertion (A): | When a current \(I=(3+4 \sin \omega t)\) flows in a wire, then the reading of a dc ammeter connected in series is \(4\) units. |
| Reason (R): | A dc ammeter measures only the value of the current amplitude. |
| 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: AC vs DC |
61%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | A capacitor can replace the choke coils in an AC circuit. |
| Reason (R): | A capacitor can reduce the current in an AC circuit like an inductor |
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: Different Types of AC Circuits |
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | On the increasing frequency of a.c. through a conductor resistance of the circuit may increase. |
| Reason (R): | Resistance of a conductor is directly proportional to the frequency of the a.c. input. |
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: Different Types of AC Circuits |
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Given below are two statements:
| Statement I: | In an LCR circuit, the total energy stored is constant at resonance. |
| Statement II: | Resistance of the LCR circuit doesn't affect the total energy stored in the circuit at resonance. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
Subtopic: Different Types of AC Circuits |
From NCERT
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Given below are two statements:
| Statement I: | Average value of AC is always zero in a one-time period. |
| Statement II: | Net charge transferred in one time period of AC is zero. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
Subtopic: RMS & Average Values |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Average power in series LCR ac circuit is maximum at resonance. |
| Reason (R): | At the resonance circuit is purely resistive. |
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: Different Types of AC Circuits |
78%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Current through a pure inductor is wattless. |
| Reason (R): | Phase difference between e.m.f across a pure inductor and current through it is 90 °or π/2 . |
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: Different Types of AC Circuits |
77%
From NCERT
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Given below are two statements:
| Statement I: | DC and AC both can be measured by a hot wire instrument. |
| Statement II: | A hot wire instrument works on the principle of the magnetic effect of current. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
Subtopic: AC vs DC |
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