Volume of copper for four wire two-phase ac systems

Q.  The volume of copper required in case of four 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: 1/2 cos2φ

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