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:
A. its thermal expansion is high
B. material always remains porous
C. moisture condenses more readily on its surface
D. it has low resistivity when properly annealed
Answer:C
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:
A. its thermal expansion is high B. material always remains porous C. moisture condenses more readily on its surface D. it has low resistivity when properly annealed