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A two-winding transformer is converted into an auto-transformer. If we apply additive polarity and subtractive polarity for the connections, then the secondary voltage is 2640 V and 2160 V, respectively. What is the ratio of primary to secondary voltage of the original transformer? | |
A. | 66 : 54. [Wrong Answer] |
B. | 54 : 66. [Wrong Answer] |
C. | 10: 1. [Correct Answer] |
D. | 1: 10. [Wrong Answer] |