Discussion
Ring main distribution system is preferred to radial distribution system, because
Answer: A
A ring main is preferred because the voltage drop in the feeder is less.
In a ring main each distributor is fed from both ends, so the load current divides between two paths and every consumer is closer, electrically, to a supply point. The voltage drop is therefore smaller and the voltage at the far consumers is better. A fault on one section can also be isolated while the rest of the ring stays supplied, so continuity is higher than in a radial system.
A ring main costs more, not less, because it needs more conductor and switchgear. It does not change the load power factor, and a very high voltage drop is the drawback of the radial system, not the advantage of the ring.
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