Discussion
Pin insulators are normally used up to voltage of about:
Answer: C
Pin insulators are normally used up to about 33 KV.
A pin insulator must carry the whole line voltage in one piece. Above about 33 kV it becomes too large, heavy and costly to make reliably, so suspension (disc) insulators, built from a string of identical units, are used instead.
66 KV and 100 KV are suspension-insulator voltages. 25 KV is within the pin insulator's range, but it is not the upper limit the question asks about.
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