Auto transformer rating is chosen so as to have best performance when the analogous two winding transformer has ___________

two voltage levels fairly close to each other

Auto transformer rating is chosen so as to have best performance when

1.	Auto transformer rating is chosen so as to have best performance when the analogous two winding transformer has ___________
A.	two voltage levels fairly close to each other
B.	very high transformation ratio
C.	any voltage levels
D.	step down purpose
Answer» B. very high transformation ratio

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