# An AC voltage source is connected to a series $$LCR$$ circuit. When $$L$$ is removed from the circuit, the phase difference between current and voltage is $$\frac{\pi}{3}$$. If $$C$$ is instead removed from the circuit, the phase difference is again $$\frac{\pi}{3}$$ between current and voltage. The power factor of the circuit is: 1. $$0.5$$ 2. $$1.0$$ 3. $$-1.0$$ 4. zero

Subtopic:  Power factor |
66%
From NCERT
NEET - 2020
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In a transformer, the number of turns in the primary and secondary coils is 410 and 1230 respectively. If the current in the primary is 6 A, then what is the current in the secondary coil?

 1 2 A 2 18 A 3 12 A 4 1 A
Subtopic:  Transformer |
73%
From NCERT
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A $$100~\Omega$$ resistor is connected to a $$220~\text{V}$$, $$50~\text{Hz}$$ ac supply. The net power consumed over a full cycle is:

 1 $$484~\text{W}$$ 2 $$848~\text{W}$$ 3 $$400~\text{W}$$ 4 $$786~\text{W}$$
Subtopic:  Power factor |
86%
From NCERT
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A 44 mH inductor is connected to a 220 V, 50 Hz ac supply. The RMS value of the current in the circuit is:

1. 1.0 A

2. 15 A

3. 15.92 A

4. 14.29 A

Subtopic:  Different Types of AC Circuits |
79%
From NCERT
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Calculate the Q-value of a series LCR circuit with L = 2.0 H, C = 32 μF and R = 10 $$\Omega$$.

1. 35

2. 20

3. 15

4. 25

Subtopic:  Different Types of AC Circuits |
81%
From NCERT
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The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?

 (a) (b) (c) (d)

 1 (a) and (d) 2 (a), (b), (c), and (d) 3 (a) and (b) 4 only (a)

Subtopic:  AC vs DC |
78%
From NCERT
NEET - 2019
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In an L-C-R series AC circuit, the voltage across each of the components - L, C and R is 50 V. The voltage across the L-R combination will be:
1. 50 V
2. $$50 \sqrt{2} ~V$$
3. 100 V
4. 0 V

Subtopic:  Different Types of AC Circuits |
70%
From NCERT
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A transistor-oscillator using a resonant circuit with an inductance L (of negligible resistance) and a capacitance C has a frequency f. If L is doubled and C is changed to 4C, the frequency will be:

1. f/4

2. 8f

3. f/(2√2)

4. f/2

Subtopic:  Different Types of AC Circuits |
86%
From NCERT
AIPMT - 2006
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An ideal resistance R, ideal inductance L, ideal capacitance C, and AC voltmeters ${\mathrm{V}}_{1},$ ${\mathrm{V}}_{2},$ ${\mathrm{V}}_{3}$ $\mathrm{and}$ ${\mathrm{V}}_{4}$ are connected to an AC source as shown. At resonance:

 1 Reading in $$V_3$$ = Reading in $$V_1$$ 2 Reading in $$V_1$$ = Reading in $$V_2$$ 3 Reading in $$V_2$$ = Reading in $$V_4$$ 4 Reading in $$V_2$$ = Reading in $$V_3$$

Subtopic:  Different Types of AC Circuits |
84%
From NCERT
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An L-C-R series circuit with 100 Ω resistance is connected to an AC source of 200 V and an angular frequency of 300 rad/s. When only the capacitance is removed, the current lags behind the voltage by $60°$. When only the inductance is removed, the current leads the voltage by $60°$. Calculate the power dissipated in the L-C-R circuit.

1. 200 W

2. 400 W

3. 300 W

4. Zero

Subtopic:  Power factor |
64%
From NCERT
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