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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The rms value of current in an ac circuit is 10 A. The peak current in the circuit is:

1. 1.41 A
2. 14.1 A
3. 7.07 A
4. 0.707 A

Subtopic:  RMS & Average Values |
83%
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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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A 60 µF capacitor is connected to a 110 V, 60 Hz ac supply. The RMS value of the current in the circuit is:

1. 2.49 A
2. 2.12 A
3. 1.97 A
4. 1.24 A

Subtopic:  Different Types of AC Circuits |
72%
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A series LCR circuit with R = 20 Ω, L = 1.5 H and C = 35 µF is connected to a variable-frequency 200 V ac supply. When the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle?

1.2200 W
2.2000 W
3.2020 W
4. 2120 W

Subtopic:  Different Types of AC Circuits |
75%
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A radio can tune over the frequency range of a portion of the MW broadcast band: (800 kHz to 1200 kHz). If its LC circuit has an effective inductance of 200 µH, what must be the range of its variable capacitor?

1. 87.8 pF−197.7 pF
2. 88.3 pF−198.8 pF
3. 89.3 pF−199.1 pF
4. 89.1 pF−196.9 pF

Subtopic:  Different Types of AC Circuits |
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Figure shows a series LCR circuit connected to a variable frequency 230 V source. L = 5.0 H, C = 80 $\mathrm{\mu }$F, R = 40$\Omega$

The amplitude of current at the resonating frequency is:

1. 8.13 A
2. 3.82 A
3. 4.44 A
4. 1.41 A

Subtopic:  Different Types of AC Circuits |
60%
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Figure shows a series LCR circuit connected to a variable frequency 230 V source. L = 5.0 H, C = 80uF, R = 40 $\Omega$

The RMS potential drop across the resistor under the resonating condition is:

1. 200 V
2. 220 V
3. 230 V
4. 0

Subtopic:  Different Types of AC Circuits |
68%
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A coil of inductance 0.50 H and resistance 100 $\Omega$ is connected to a 240 V, 50 Hz ac supply. What is the maximum current in the coil?

1. 1.29 A
2. 1.82 A
3. 2.29 A
4. 2.82 A

Subtopic:  Different Types of AC Circuits |
52%
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