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It is advised to coat the laminations of the core with some enamel, to ensure __________

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It is advised to coat the laminations of the core with some enamel, to ensure __________

(a) insulation

(b) adhesion of laminations

(c) reduction in humming  sound

(d) all of the mentioned

This question was addressed to me during an online interview.

My question is from Transformer as a Magnetically Coupled Circuit topic in section Transformers of Electrical Machines

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Best answer
Correct choice is (a) insulation

Best explanation: It is done to provide insulation.

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