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Transformer utilization factor of a center tapped full wave rectifier is equal to ___________

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Transformer utilization factor of a center tapped full wave rectifier is equal to ___________

(a) 0.623

(b) 0.678

(c) 0.693

(d) 0.625

I have been asked this question in an international level competition.

My enquiry is from Fullwave Rectifier in division Diode Circuit of Analog Circuits

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The correct choice is (c) 0.693

The explanation: Transformer utilization factor is the ratio of DC power supplied to the AC rating of the primary winding. The factor indicated the effectiveness of transformer usage by the rectifier. For a center tapped full wave rectifier, it is equal to 0.81 w.r.t the primary winding, 0.57 w.r.t the secondary winding (double of that of a half wave rectifier) and the average value is 0.69.

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