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Question

If an ac main supply is given to be 220 V. What would be the average e.m.f. during a positive half cycle

A
198V
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B
386V
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C
256V
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D
None of these
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Solution

The correct option is A 198V
Vav=2πV0=2π×(Vrms×2)=22π.Vrms
=22π×220=198V

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