An ideal rectifier should have transformer utilization factor (TUF) of 1. If the actual TUF is 3.5, it shows that
- A. Diode is under-loaded
- B. The transformer must be 3.5 times larger
- C. The transformer should be only 1/3.5 times the ideal size
- D. The ripple factor is low
Answer: B. The transformer must be 3.5 times larger
Explanation: TUF = Pdc / (Transformer VA rating). A lower TUF means a larger transformer is required for the same DC output; the transformer must be oversized proportionally.