Question

Which class has the lowest and the highest temperature?

(a) Class Y, Class C

(b) Class Y, Class H

(c) Class H, Class C

(d) Class B, Class H

The question was asked in my homework.

My question is based upon Temperature Rise and Insulating Materials topic in portion Electrical Engineering Materials of Design of Electrical Machines

Answer 1

Correct option is (a) Class Y, Class C

Explanation: Class Y belongs to the lowest insulation class of having temperature of about 90°C. Class  C is the highest insulation class of having temperature above 180°C.