Which of the following materials is preferred for transmitting electrical energy over long distance ?
Correct answer: D. Steel reinforced aluminium
- A. Copper
- B. Aluminium
- C. Steel reinforced copper
- D. Steel reinforced aluminium
Explanation
Steel-reinforced aluminium conductors combine aluminium's low weight and good conductivity with steel's mechanical strength, making them suitable for long overhead transmission spans. Copper is more conductive but substantially heavier and costlier.
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