Physics · Transformers

The utilization of an auto-transformer is more economical compared to a two-winding transformer only when the voltage ratio (k) is:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1equal to 0.5
2equal to 0.2
3close to 0.9✓
4equal to 0.1

Correct answer

close to 0.9

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The utilization of an auto-transformer is more economical compared to a two-winding transformer only when the voltage ratio (k) is:

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