Discussion
The pin type insulators are uneconomical beyond :
Answer: C
Pin type insulators become uneconomical beyond 33 kV.
A pin insulator is a single piece mounted on a pin on the cross-arm. As the voltage rises it must be made larger and heavier, with more sheds and greater thickness, so that above about 33 kV it becomes bulky, costly and hard to make reliably. Above that level suspension insulators, built up from strings of discs, are used instead, because the voltage rating can be raised simply by adding discs.
11 kV is well within the pin insulator's range, and 50 kV and 60 kV are already past the point where it is economical.
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