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Question

The percentage saving in copper feeder if the line voltage in a 2-wire DC system is raised from 220 V to 500 V for the same power transmitted over the same distance and having the same power loss is : 

A.

85.64 percent 

B.

80.64 percent 

C.

78.64 percent 

D.

84.64 percent

Answer ( Option B)

80.64 percent 

Solution

Copper saving :

Hence, the correct option is (B).

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