Volume of copper for three wire two phase ac systems

Q.  The volume of copper required in case of three wire two phase ac systems is how many times to that of two wired dc system?
- Published on 23 Nov 15

a. 2/cos2φ
b. 1/2 cos2φ
c. 1.457/ cos2φ
d. 6/1.457 cos2φ

ANSWER: 1.457/ cos2φ

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