Discussion
As compared to copper conductors, which of the following is not a valid drawback of aluminium conductors?
Answer: C
Higher cost is not a drawback of aluminium conductors compared with copper. Aluminium is cheaper than copper and also lighter, which is why it is used for overhead lines.
The drawbacks of aluminium are a smaller tensile strength, a smaller conductivity (so a larger cross section is needed for the same resistance) and a higher coefficient of linear expansion. So the third option is the answer.
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