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Question

In a 3 phase transmission line, transmission efficiency increases when : 

A.

line voltage is increased 

B.

current density is increased 

C.

power factor is decreased 

D.

length of the conductor is increased

Answer ( Option A)

line voltage is increased 

Solution

In a 3 phase transmission line, transmission efficiency increases when line voltage is increased.


Total power losses = I2R

% transmission efficiency

Hence, the correct option is (A).

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