In a DC 2-wire feeder, the drop per feeder conductor is 2%. Find the transmission efficiency of the feeder.

The correct answer is option 3): 96%

Concept :

Transmission capacity of feeder:

• When the load is connected then both wires become in series.
• So, the voltage drop across each wire will add up to give the total voltage drop.

Calculation:

Consider two-line L₁ and L2 as shown in the figure,

• As we know, both wires are in series, so the voltage drop adds up to give a total voltage drop. As per the wire voltage drop is 2% so the total voltage drop will be 4%. Hence, 100% - 4% = 96% voltage will reach the load end.