Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
Correct answer: A. approximately equal to one
- A. approximately equal to one
- B. less than one
- C. great than one
- D. none of the above
Explanation
An autotransformer uses the greatest fraction of its winding as common copper when its voltage ratio is close to unity, giving the largest copper saving and lower copper loss compared with a two-winding transformer. Ratios far from unity reduce this advantage.
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