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In a full wave rectifier circuit operating from 90 HZ mains frequency. The fundamental frequency in the ripple would be

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50 HZ

25 HZ

180 HZ

70.7 HZ

answer is C.

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Detailed Solution

Given f = 90 HZ T = $\frac{1}{90}$
For full wave rectifier , $T_{1} = \frac{T}{2} = \frac{1}{180}$
$∴ f_{1} = 180 H Z (∴ f = \frac{1}{T})$

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