In a series RLC alternating current circuit, the r.m.s. value of current is l, the average power loss in the circuit is

1. l2 R
2. l2 ωL
3. l2 ωC 
4. l2 ωL-1ωC

Subtopic:  Different Types of AC Circuits |
 69%
From NCERT
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A step-down transformer transforms 200 V to 100 volts. If the current in primary and secondary coils are 6 A and 9.6 A respectively, the efficiency of the transformer is

1. 60%

2. 70%

3. 80%

4. 90%

Subtopic:  Transformer |
 84%
From NCERT
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An ideal inductor connected to a cell is shown in figure. Select the correct relations between readings of ammeters A1 and A2 just after the switch is closed and a long time after closing the switch

1. A1>A2 ; A1<A2
2. A1>A2 ; A2=A1
3. A1<A2 ; A1 < A2
4. A1<A2 ; A1 =A2

Subtopic:  AC vs DC |
 63%
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The power dissipated in the following circuit will be about half of its maximum value at approximately

1. ω= 1050 rad/s
2. ω=1000 rad/s
3. ω=950 rad/s
4. Both (1) & (3)

Subtopic:  Different Types of AC Circuits |
 64%
From NCERT
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An ac source of emf e=50 sin 100 πt is connected across a circuit for which the phasor diagram is shown in the figure. The time difference between current and voltage applied across the circuit is

1. 1.25 ms

2. 1.33 ms

3. 1.67 ms

4. 1.85 ms

Subtopic:  Different Types of AC Circuits |
 65%
From NCERT
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The instantaneous values of current (in ampere) and potential (in volt) in an A.C. circuit are I= 4 sinωt and V=100cosωt-π3 respectively. The power factor of the circuit is

1. 12 
2. 12
3. 1
4. 32

Subtopic:  Different Types of AC Circuits |
 54%
From NCERT
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In the given A.C. circuit, the instantaneous current through inductor and capacitor are 0.8 A and 0.4 A respectively. The instantaneous current through the resistor is 

1. 1.2 A

2. 0.6 a

3. 0.4 A

4. 0.8 A

Subtopic:  Different Types of AC Circuits |
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In the LCR series A.C. circuit, as we vary the frequency of A.C. source, peak current is obtained. The value of this peak current, apart from the supply voltage, depends upon (symbols have their usual meaning)

1. L and R

2. L and C

3. R and C

4. R only

Subtopic:  Different Types of AC Circuits |
 61%
From NCERT
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A direct current of \(2~\text{A}\) and an alternating current having peak value \(2~\text{A}\) flow through two identical resistance at the same time. The ratio of heat produced in the two resistance will be:
1. \(1:1\)
2. \(1:2\)
3. \(2:1\)
4. \(4:1\)

Subtopic:  AC vs DC |
 65%
From NCERT
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The inductive reactance and resistance of the L-R circuit are respectively 30 ohm and 40 ohm. The impedance of the circuit is

1. 50 ohm

2. 10 ohm

3. 70 ohm

4. 43 ohm

Subtopic:  Different Types of AC Circuits |
 91%
From NCERT
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