The output current versus time curve of a rectifier is shown in the figure. The average value of output current in this case is 

(1) 0

(2) I02

(3) 2I0π

(4) I0

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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)

Concept Questions :-

Rms and average values
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When an ac source of e.m.f. e=E0sin(100t) 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 &pi:/4, as shown in the diagram. If the circuit consists possibly only of RC or LC in series, find the relationship between the two elements 

(1) R=1kΩ,C=10μF

(2) R=1kΩ,C=1μF

(3) R=1kΩ,L=10H

(4) R=1kΩ,L=1H

Concept Questions :-

Different types of AC Circuits
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Two sinusoidal voltages of the same frequency are shown in the diagram. 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

–π/4

(2)

2.5

–π/2

(3)

2.5

+π/2

(4)

2.5

–π/4

 

Concept Questions :-

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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

Concept Questions :-

Different types of AC Circuits
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A filament bulb (500 W,100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is 

(a) 230Ω          (b) 46Ω

(c) 26Ω            (d) 13Ω

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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

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The potential differences across the resistance, capacitance and inductance are 80V, 40Vand 100V respectively in an L-C-R circuit. The power factor of this circuit is

(a) 0.4              (b) 0.5

(c) 0.8              (d) 1.0

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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

(a) 2.2 A              (b) 11A

(c) 4.4A               (d) 112A

Concept Questions :-

Different types of AC Circuits
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A small-signal voltage V(t)=Vo sinωt is applied across an ideal capacitor C 
(a) over a full cycle, the capacitor C does not consume any energy from the voltage         source
(b) current I(t) is in phase with voltage V(t)
(c) current I(t) leads voltage V(t) by 180°
(d) current I(t) lags voltage V(t) by 90°

Concept Questions :-

Rms and average values
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