Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which of the following DC distribution system is the simplest and cheapest in first cost?
Radial
Ring main
Interconnected
None of above
Radial
The radial distribution system is the simplest and cheapest because it involves a single main feeder branching out to individual loads without any closed loops. In this configuration, electricity flows in only one direction from the source to the load, minimizing the amount of conductor material and switchgear required.
The radial distribution system is the simplest and cheapest because it involves a single main feeder branching out to individual loads without any closed loops. In this configuration, electricity flows in only one direction from the source to the load, minimizing the amount of conductor material and switchgear required.
CтИЭL├ЧI
In a radial system, the power source is connected to one end of the distributor, and branches are taken off at various points to supply consumers. Because it does not provide alternative paths for power in case of a fault, the complexity of protection, redundancy, and cabling is significantly reduced compared to ring main or interconnected systems.
Simplest topological arrangement in power distribution.
Lowest capital expenditure (first cost) due to minimal feeder length.
Significant voltage drop at the end of the line.
Low reliability: a fault on the main feeder interrupts power to all downstream loads.
Very low initial installation cost.
Simple design and protection schemes.
Easy planning and expansion in suburban areas.
High probability of supply interruption for all loads during a feeder fault.
Load at the end of the radial line experiences the lowest voltage.
Not suitable for high-density, critical urban loads.
Rural electrification.
Low-density residential colonies.
Areas where reliability requirements are lower.
| Feature | Radial | Ring Main |
|---|---|---|
Cost | Lowest | High |
Reliability | Low | High |
Ring main and interconnected systems provide redundant paths for power flow, which increases reliability but also increases capital expenditure (copper/aluminum cost, switchgear, and protection coordination).
In a ring main system, the distributor is closed to form a loop; if a fault occurs, the power can be fed from two directions.
A is correct тАФ The radial system is the most economical design because it uses the minimum amount of conductor material and simpler switchgear compared to loop or interconnected networks.
When comparing distribution systems, always remember the trade-off: higher reliability (Ring/Interconnected) always demands higher capital cost (CтИЭComplexity).