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What material is the paper strips stuck with?

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in Design of Electrical Machines by (687k points)
What material is the paper strips stuck with?

(a) synthetic resin varnish

(b) shellac

(c) synthetic resin varnish and shellac

(d) synthetic resin varnish or shellac

This question was posed to me in an internship interview.

Query is from Design of Field Winding in portion Design of Synchronous Machines of Design of Electrical Machines

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The correct answer is (d) synthetic resin varnish or shellac

To explain I would say: The paper strips used in the Class B insulation machines are stuck on with shellac. They are also made of the synthetic resin varnish materials.

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