Preferred connection for connecting line tap changers to transformers

Q.  Which connection is preferred for connecting line tap changers to transformers?
- Published on 28 Sep 15

a. 3 wire 3 phase AC system
b. 3 wire 2 phase AC system
c. 4 wire 3 phase AC system
d. All of these

ANSWER: 4 wire 3 phase AC system

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