In the circuit shown below, what will be the readings of the voltmeter and ammeter?
           

1. 800 V, 2 A

2. 300 V, 2 A

3. 220 V, 2.2 A

4. 100 V, 2 A

Subtopic:  Different Types of AC Circuits |
 88%
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The diagram shows a capacitor C and a resistor R connected in series to an ac source. V1 and V2 are voltmeters and A is an ammeter:

Consider now the following statements

I. Readings in A and V2 are always in phase

II. Reading in V1 is ahead in phase with reading in V2

III. Readings in A and V1 are always in phase

Which of these statements is/are correct?

(1) I only

(2) II only

(3) I and II only

(4) II and III only

Subtopic:  Different Types of AC Circuits |
 56%
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In the circuit shown in figure neglecting source resistance the voltmeter and ammeter reading will respectively, will be 

(1) 0V, 3A

(2) 150V, 3A

(3) 150V, 6A

(4) 0V, 8A

Subtopic:  Different Types of AC Circuits |
 86%
From NCERT
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In the circuit shown in the figure, the ac source gives a voltage V=20cos(2000 ​t). Neglecting source resistance, the voltmeter and ammeter reading will be: 

(1) 0V, 0.47A

(2) 1.68V, 0.47A

(3) 0V, 1.4 A

(4) 5.6V, 1.4 A

Subtopic:  RMS & Average Values |
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An ac source of angular frequency ω is fed across a resistor r and a capacitor C in series. I is the current in the circuit. If the frequency of the source is changed to ω/3 (but maintaining the same voltage), the current in the circuit is found to be halved. Calculate the ratio of reactance to resistance at the original frequency ω.
1. 35
2. 25
3. 15
4. 45

Subtopic:  Different Types of AC Circuits |
 64%
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For a series RLC circuit, R = XL = 2XC. The impedance of the circuit and phase difference between V and i will be:

1. 5R2, tan1(2)

2. 5R2,tan112

3. 5XC,tan1(2)

4. 5R, tan112

Subtopic:  Different Types of AC Circuits |
 72%
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In the adjoining ac circuit the voltmeter whose reading will be zero at resonance is

(1) V1

(2) V2

(3) V3

(4) V4

Subtopic:  Different Types of AC Circuits |
 86%
From NCERT
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In the adjoining figure, the impedance of the circuit will be:

(1) 120 ohm

(2) 50 ohm

(3) 60 ohm

(4) 90 ohm

Subtopic:  Different Types of AC Circuits |
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In a series LCR circuit, which one of the following curves represents the variation of impedance (Z) with frequency (f)?

1. 2.
3. 4.
Subtopic:  Different Types of AC Circuits |
 55%
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The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit are shown in the figure. Which of the following statements is correct?

1. The voltage lags behind the current by π/2.
2. The voltage leads the current by π/2.
3. The voltage and the current are in phase.
4. The voltage leads the current by π.

Subtopic:  RMS & Average Values |
 79%
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