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How many classes have their temperatures above 150°C?(a) 2(b) 3(c) 4(d) 5I got this question during an interview.I'm obligated to ask this question of Temperature Rise and Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines

Answer»

The correct choice is (b) 3

Easiest explanation: Of 7 classes of insulation, there are 3 classes WHOSE temperatures are above 150°C. They are classes F, H, C of insulation.



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