A capacitor acts as an infinite resistance for

1. DC

2. AC

3. DC as well as AC

4. neither AC nor DC

Subtopic: Different Types of AC Circuits |

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An AC source producing emf

ε = ε_{0} [cos(100 π s^{–1})t + cos(500 π s^{–1})t]

is connected in series with a capacitor and a resistor. The steady-state current in the circuit is found to be

i = i_{1} cos [(100 π s^{–1})t +ϕ_{1}] i_{2} cos[(500 π s^{–1})t + φ_{2}]

1. i_{1} > i_{2}

2. i_{1} = i_{2}

3. i_{1} < i_{2}

4. the information is insufficient to find the relation between i_{1} and i_{2}

From NCERT

Subtopic: Different Types of AC Circuits |

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The peak voltage in a 220 V AC source is

1. 220 V

2. about 160 V

3. about 310 V

4. 440 V

Subtopic: RMS & Average Values |

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An AC source is rated 220 V, 50 Hz. The average voltage is calculated in a time interval of 0.01 s. It

1. must be zero

2. may be zero

3. is never zero

4. is (220\(\sqrt2\) ) V

Subtopic: RMS & Average Values |

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The magnetic field energy in an inductor changes from maximum value to minimum value in 5.0 ms when connected to an AC source. The frequency of the source is:

1. 20 Hz

2. 50 Hz

3. 200 Hz

4. 500 Hz

1. 20 Hz

2. 50 Hz

3. 200 Hz

4. 500 Hz

Subtopic: LC Oscillations |

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Which of the following plots may represent the reactance of a series LC combination?

Correct option:

1. a

2. b

3. c

4. d

Correct option:

1. a

2. b

3. c

4. d

From NCERT

Subtopic: Different Types of AC Circuits |

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A series AC circuit has a resistance of 4 Ω and a reactance of 3. Ω. The impedance of the circuit is

1. 5 Ω

2. 7 Ω

3. 12/7 Ω

4. 7/12 Ω

Subtopic: Different Types of AC Circuits |

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Transformers are used

1. in DC circuits only

2. in AC circuits only

3. in both DC and AC circuits

4. neither in DC nor in AC circuits

Subtopic: Transformer |

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An alternating current is given by

i – i_{1} cos ωt + i_{2} sin ωt

The rms current is given by

1. \(\frac{i_{1}+i_{2}}{\sqrt{2}}\)

2. \(\frac{\left|i_{1}+i_{2}\right|}{\sqrt{2}}\)

3. \(\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{2}}\)

4. \(\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{\sqrt{2}}}\)

Subtopic: RMS & Average Values |

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An alternating current having peak value 14 A is used to heat a metal wire. To produce the same heating effect, a constant current i can be used where i is

1. 14 A

2. about 20 A

3. 7 A

4. about 10 A

Subtopic: Power factor |

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