A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply. The net power consumed over a full cycle is:

1. 484 W

2. 848 W

3. 400 W

4. 786 W

Subtopic: Power factor |

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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

81%

Subtopic: RMS & Average Values |

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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 |

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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 |

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A charged 30 µF capacitor is connected to a 27 mH inductor. What is the angular frequency of free oscillations of the circuit?

$\left(1\right)1.11\times {10}^{3}rad/s\phantom{\rule{0ex}{0ex}}\left(2\right)2.11\times {10}^{3}rad/s\phantom{\rule{0ex}{0ex}}\left(3\right)1.11\times {10}^{2}rad/s\phantom{\rule{0ex}{0ex}}\left(4\right)1.11\times {10}^{4}rad/s$

62%

Subtopic: LC Oscillations |

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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:

$\left(1\right)2.49A\phantom{\rule{0ex}{0ex}}\left(2\right)2.12A\phantom{\rule{0ex}{0ex}}\left(3\right)1.97A\phantom{\rule{0ex}{0ex}}\left(4\right)1.24A$

72%

Subtopic: Different Types of AC Circuits |

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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?

$\left(1\right)2200W\phantom{\rule{0ex}{0ex}}\left(2\right)2000W\phantom{\rule{0ex}{0ex}}\left(3\right)2020W\phantom{\rule{0ex}{0ex}}\left(4\right)2120W$

77%

Subtopic: Different Types of AC Circuits |

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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?

$\left(1\right)87.8pF-197.7pF\phantom{\rule{0ex}{0ex}}\left(2\right)88.3pF-198.8pF\phantom{\rule{0ex}{0ex}}\left(3\right)89.3pF-199.1pF\phantom{\rule{0ex}{0ex}}\left(4\right)89.1pF-196.9pF$

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

59%

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 = 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

65%

Subtopic: Different Types of AC Circuits |

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