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.
B. 54 : 66.
C. 10: 1.
D. 1: 10.
Show Answer
Answer: C
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