Fig. below shows a 2 wire DC distributor
cable AC of 4 km long supplying loads of 100A and 200A at distances of 2 km and
4 km from A. The feeder is fed at point A with a voltage of 500V. The voltage
available at the farthest point in the system is_________.
(Assume
conductor resistance per km as 
)
470V
476V
480V
460V
460V
for 2 wire D.C. distributor cable
current in section AB = 300 A
current in section BC = 200 A
Voltage drop in section AB = 300 X 0.04 X 2 = 24V
Voltage drop in section BC + 200 X 0.04 X 2 = 16V
Voltage across cable C = 476 -16 = 460V
Voltage across cable 460V will get at
(C) farthest point in the system.
Hence, the correct option is (D).
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