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Transformer utilization factor of a centre tapped full wave rectifier is_________

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Transformer utilization factor of a centre tapped full wave rectifier is_________

(a) 0.623

(b) 0.678

(c) 0.693

(d) 0.625

I have been asked this question in a national level competition.

This interesting question is from Full-wave Rectifier topic in section Application of Diodes of Electronic Devices & Circuits

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Right option is (c) 0.693

The best explanation: Transformer utilisation factor is the ratio of AC power delivered to load to the DC power rating. This factor indicates effectiveness of transformer usage by rectifier. For a half wave rectifier, it’s low and equal to 0.693.

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