An ac source of variable frequency f is connected to an LCR series circuit. Which one of the graphs in the figure represents the variation of the current I in the circuit with frequency f :

(1)

(2)

(3)

(4)

Subtopic:  Different Types of AC Circuits |
 78%
From NCERT
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A constant voltage at different frequencies is applied across a capacitance C as shown in the figure.
          
Which of the following graphs accurately illustrates how current varies with frequency?

1. 2.
3. 4.   
Subtopic:  Different Types of AC Circuits |
 59%
From NCERT
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The output current versus time curve of a rectifier is shown in the figure. The average value of the output current in this case will be:

1. 0 2. \(I_0 \over 2\)
3. \(2I_0 \over \pi\) 4. \(I_0\)
Subtopic:  RMS & Average Values |
 66%
From NCERT
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The current 'i' in an inductance coil varies with time 't' according to the following graph.

Which one of the following plots shows the variations of voltage in the coil?

(1)

(2)

(3)

(4)

Subtopic:  RMS & Average Values |
 61%
From NCERT
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When an ac source of e.m.f. e=E0sin(100 t) is connected across a circuit, the phase difference between the e.m.f. e and the current i in the circuit is observed to be \(\frac{\pi}{4}\) as shown in the diagram. If the circuit consists only of RC or LC in series, then what is the relationship between the two elements?

1. \(R=1 k \Omega, C=10 \mu F\)
2. \(R=1 k \Omega, C=1 \mu F\)
3. \(R=1 k \Omega, L=10 \ H\)
4. \(R=1 k \Omega, L=1 \ H\)

Subtopic:  Different Types of AC Circuits |
 54%
From NCERT
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In the diagram, two sinusoidal voltages of the same frequency are shown. What is the frequency and the phase relationship between the voltages?
      

Frequency in Hz Phase lead of \(N\) over \(M\) in radians
1. \(0.4\) \(-\pi/4\)
2. \(2.5\) \(-\pi/2\)
3. \(2.5\) \(+\pi/2\)
4. \(2.5\) \(-\pi/4\)
Subtopic:  AC vs DC |
 67%
From NCERT
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Which of the following plots may represent the reactance of a series of LC combinations?


1. a

2. b

3. c

4. d

Subtopic:  Different Types of AC Circuits |
From NCERT
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Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

(a) R=20Ω, L=1.5H,C=35 μF

(b) R=25Ω, L=2.5H,C=45 μF

(c) R=15Ω, L=3.5H,C=30 μF

(d) R=25Ω, L=1.5H,C=45 μF

Subtopic:  Different Types of AC Circuits |
 69%
From NCERT
NEET - 2016
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The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. What is the power factor of this circuit?

1. 0.4             

2. 0.5

3. 0.8             

4. 1.0

Subtopic:  Power factor |
 81%
From NCERT
NEET - 2016
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A 100 Ω resistance and a capacitor of 100 Ω reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

(1) 2.2 A             

(2) 11A

(3) 4.4A               

(4) 112A

Subtopic:  Different Types of AC Circuits |
 56%
From NCERT
NEET - 2016
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