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 |
 89%
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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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In the circuit shown in the figure, neglecting source resistance, the voltmeter and ammeter reading respectively will be:

          

1. \(0~\text{V}, 3~\text{A}\)
2. \(150~\text{V}, 3~\text{A}\)
3. \(150~\text{V}, 6~\text{A}\)
4. \(0~\text{V}, 8~\text{A}\)

Subtopic:  Different Types of AC Circuits |
 86%
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An AC source of variable frequency \(f\) is connected to an \(LCR\) series circuit. Which of the following graphs represents the variation of the current \(I\) in the circuit with frequency \(f\)?

1.   2.
3. 4.
Subtopic:  Different Types of AC Circuits |
 76%
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Which of the following plots may represent the reactance of a series LC combination 

(1) a

(2) b

(3) c

(4) d

Subtopic:  Different Types of AC Circuits |
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In an ac circuit, I = 100 sin 200 πt. The time required for the current to achieve its peak value will be

1. 1100sec

2. 1200sec

3. 1300sec

4. 1400sec

Subtopic:  RMS & Average Values |
 54%
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Subtopic:  RMS & Average Values |
 91%
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Subtopic:  Different Types of AC Circuits |
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An inductor of \(20~\text{mH},\) a capacitor of \(50~ \mu \text{F},\) and a resistor of \(40~ \Omega\) are connected in series across a source of emf \(V= 10\sin340t\). What will be the power loss in the AC circuit?
1. \(0.67~\text{W}\) 2. \(0.78~\text{W}\)
3. \(0.89~\text{W}\) 4. \(0.46~\text{W}\)
Subtopic:  Power factor |
From NCERT
NEET - 2016
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The rms value of potential difference V shown in the figure is

                        

(1) Vo                                                     

(2) Vo2

(3)Vo2                                                     

(4) Vo3   

Subtopic:  RMS & Average Values |
 80%
From NCERT
NEET - 2011
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