Question

For machines with Class B insulation, how many layers of inter turn insulation is made use of and what is the distance between the layers?

(a) 4, 0.18 mm

(b) 3, 0.25 mm

(c) 2, 018 mm

(d) 2, 0.25 mm

I have been asked this question by my school teacher while I was bunking the class.

I want to ask this question from Design of Field Winding in portion Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right answer is (c) 2, 018 mm

Easy explanation: The machines using Class B insulation makes use of 2 layers of inter turn insulation. The distance between the insulation is given to be 0.18 mm.