One of the
most commonly used materials for insulators of an overhead transmission line,
i.e. glass, has the drawback (when used as an insulator material) that :
its thermal expansion is high
material
always remains porous
moisture
condenses more readily on its surface
it has low
resistivity when property annealed
moisture
condenses more readily on its surface
Drawback for
insulator of an overhead transmission line i.e. glass is moisture condenses
more readily on its surface.
Hence, the
correct option is (C).
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