In an 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?
(a) Use more turns of wire in the coil
(b) User 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:  AC Generator |
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A series R-C circuit is connected to an alternating voltage source. Consider two situations 
(i) When the capacitor is air filled 
(ii) When the capacitor is mica filled 
Current passing through the resistor is I and voltage drop on capacitor is V. Then 
1. Va > V
2. Va < V
3. Va = V
4. Can't be predicted 
Subtopic:  Different Types of AC Circuits |
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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:  Different Types of AC Circuits |
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Choose the correct statements regarding a series \(\text{LCR}\) 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:  Different Types of AC Circuits |
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An AC supply is connected across a series LCR circuit. If capacitor is removed, then which of the following phasor diagram may be correct for the remaining circuit? 
 
1. 2.
3. 4.
Subtopic:  Different Types of AC Circuits |
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The variation of an alternating current I = I0sin \(\omega t\) with time (t) as shown in the figure. The average value of current for half cycle will be: 
              
\(1.~ \frac{I_{0}}{\pi}\\ 2.~ \frac{I_{0}}{2}\\ 3.~ \frac{2 I_{0}}{\pi}\\ 4.~ \frac{I_{0}}{2 \pi}\)
Subtopic:  RMS & Average Values |
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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.
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. (A) is false and (R) is also false.
Subtopic:  Different Types of AC Circuits |
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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. (A) is false and (R) is also false.
Subtopic:  Power factor |
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Assertion (A): A transformer cannot work on a steady DC supply.
Reason (R): Steady DC changes neither in magnitude nor in direction.
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. (A) is false and (R) is also false.
Subtopic:  Transformer |
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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 \(\pi\)
In light of the above statements, choose the most appropriate answer from the options given below:
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:  Different Types of AC Circuits |
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