In a series LCR circuit, resistance R = 10Ω and the impedance Z = 20Ω. The phase difference between the current and the voltage is 

(1) 30°

(2) 45°

(3) 60°

(4) 90°

Subtopic:  Different Types of AC Circuits |
 82%
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In the circuit shown below, the ac source has voltage V=20cos(ωt) volts with ω = 2000 rad/sec.  The amplitude of the current is closest to:
         

1. 2 A

2. 3.3 A

3. 2/5  A

4. 5  A

Subtopic:  Different Types of AC Circuits |
 54%
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In an ac circuit the reactance of a coil is 3 times its resistance, the phase difference between the voltage across the coil to the current through the coil will be 

(1) π/3

(2) π/2

(3) π/4

(4) π/6

Subtopic:  Different Types of AC Circuits |
 76%
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The power factor of an ac circuit having resistance (R) and inductance (L) connected in series and an angular velocity ω is 

(1) R/ωL

(2) R/(R2+ω2L2)1/2

(3) ωL/R

(4) R/(R2ω2L2)1/2

Subtopic:  Different Types of AC Circuits |
 84%
From NCERT
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An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω. The power dissipated in the circuit is:

1. (R2+ω2L2)V

2. V2R(R2+ω2L2)

3. V(R2+ω2L2)

4. R2+ω2L2V2

Subtopic:  Power factor |
 79%
From NCERT
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In an LCR circuit, the potential difference between the terminals of the inductance is 60 V, between the terminals of the capacitor is 30 V and that between the terminals of the resistance is 40 V. The supply voltage will be equal to:

1. 50 V

2. 70 V

3. 130 V

4. 10 V

Subtopic:  Different Types of AC Circuits |
 87%
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In a circuit, L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45°. The value of C will be:

1. 12πf(2πfL+R)

2. 1πf(2πfL+R)

3. 12πf(2πfLR)

4. 1πf(2πfLR)

Subtopic:  Different Types of AC Circuits |
 61%
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In an LR-circuit, the inductive reactance is equal to the resistance R of the circuit. An e.m.f. E=E0cos(ωt) applied to the circuit. The power consumed in the circuit is:

(1) E02R

(2) E022R

(3) E024R

(4) E028R

Subtopic:  Different Types of AC Circuits |
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One 10 V, 60 W bulb is to be connected to 100 V line. The required induction coil has a self-inductance of value: (f = 50 Hz) 

(1) 0.052 H

(2) 2.42 H

(3) 16.2 mH

(4) 1.62 mH

Subtopic:  Different Types of AC Circuits |
 55%
From NCERT
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In the circuit given below, what will be the reading of the voltmeter 

(1) 300 V

(2) 900 V

(3) 200 V

(4) 400 V

Subtopic:  Different Types of AC Circuits |
 92%
From NCERT
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