# 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 |
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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 |
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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 |
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A coil of inductance 0.50 H and resistance 100 Ω is connected to a 240 V, 50 Hz ac supply. What is the time lag between the voltage maximum and the current maximum?

1.  4.11×10−3 s
2.  2.10×10−3 s
3.  3.19×10−3 s
4.  2.23×10−3 s

Subtopic:  Different Types of AC Circuits |
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A 100 µF capacitor in series with a 40 $\Omega$ resistance is connected to a 110 V, 60 Hz supply. What is the maximum current in the circuit?

1. 2.19 A
2. 2.29 A
3. 3.14 A
4. 3.24 A

Subtopic:  Different Types of AC Circuits |
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A circuit containing an 80 mH inductor and a 60 µF capacitor in series is connected to a 230 V, 50 Hz supply. The resistance of the circuit is negligible. the current amplitude is:

1. 11.63 A
2. 8.22 A
3. 10.0 A
4. 9.21 A

Subtopic:  Different Types of AC Circuits |
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A circuit containing an 80 mH inductor and a 60 µF capacitor in series is connected to a 230 V, 50 Hz supply. The resistance of the circuit is negligible. What is the average power transferred to the inductor?

1. 18 J/s
2. 0
3. 12 J/s
4. 19 J/s

Subtopic:  Different Types of AC Circuits |
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A series LCR circuit with = 0.12 H, = 480 nF, = 23 $\Omega$ is connected to a 230 V variable frequency supply. What is the source frequency for which current amplitude is maximum?

1. 444.4 Hz
2. 663.48 Hz
3. 545.0 Hz
4. 343.41 Hz

Subtopic:  Different Types of AC Circuits |
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A series LCR circuit with = 0.12 H, = 480 nF, = 23 $\Omega$ is connected to a 230 V variable frequency supply. What is the Q-factor of the given circuit?

1. 11.11
2. 13.31
3. 21.74
4. 22.21

Subtopic:  Different Types of AC Circuits |
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A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wirelines carrying power is 0.5 $\Omega$ per km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town. The line power loss in the form of heat is:

1. 100 kW
2. 500 kW
3. 400 kW
4. 600 kW

Subtopic:  RMS & Average Values |
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