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How many classifications of overhead line insulators are there?

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How many classifications of overhead line insulators are there?

(a) 3

(b) 4

(c) 5

(d) 6

I got this question during a job interview.

This is a very interesting question from Insulating Materials topic in chapter Electrical Engineering Materials of Design of Electrical Machines

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The correct choice is (a) 3

The explanation: There are basically 3 types of overhead line insulators. They are Pin type, Suspension type and Stray Insulator type.

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