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: Â RMS & Average Values |

Â 75%

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An AC source is rated \(220~\mathrm{V}\), \(50~\mathrm{Hz}\). The average voltage is calculated in a time interval of \(0.01~\mathrm{s}\). It,

1. | must be zero |

2. | may be zero |

3. | is never zero |

4. | \(220\sqrt{2}\) V | is

Subtopic: Â RMS & Average Values |

Â 51%

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An alternating current is given by

\(i=i_1 \cos \omega t+i_2 \sin \omega t\)

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: Â RMS & Average Values |

Â 84%

From NCERT

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A constant current of 2.8 A exists in a resistor. The RMS current is

1. 2.8 A

2. about 2 A

3. 1.4 A

4. undefined for a direct current

Subtopic: Â RMS & Average Values |

Â 51%

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An inductor coil having some resistance is connected to an AC source. Which of the following quantities have zero average value over a cycle?

(A) |
Current |

(B) |
Induced EMF in the inductor |

(C) |
Joule heat |

(D) |
Magnetic energy stored in the inductor |

Choose the correct option

1. | (A) only |

2. | (B) and (C) only |

3. | (C) and (D) only |

4. | (A) and (B) only |

Subtopic: Â RMS & Average Values |

Â 53%

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The AC voltage across a resistance can be measured using

(a) a potentiometer

(b) a hot-wire voltmeter

(c) a moving-coil galvanometer

(d) a moving-magnet galvanometer

Choose the correct option

1. (a), (b)

2. (b) only

3. (c), (d)

4. (a), (d)

Subtopic: Â RMS & Average Values |

Â 66%

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