Question

What is the thickness of the flanges and what material is used in the flanges?

(a) 10 mm thick, resins

(b) 10 mm thick, asbestos

(c) 15 mm thick, asbestos

(d) 10 mm thick, bakelized asbestos

I had been asked this question by my college director while I was bunking the class.

My doubt stems from Design of Field Winding in portion Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right answer is (d) 10 mm thick, bakelized asbestos

To explain I would say: The flanges used in the Class B insulation is made up of 10 mm thickness. The flanges are made up of the bakelized asbestos.