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If it asked by the customer to provide tappings on the transformer, the most efficient and economical way to provide it at ____________

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If it asked by the customer to provide tappings on the transformer, the most efficient and economical way to provide it at ____________

(a) middle of hv winding

(b) phase end of hv winding

(c) neutral end of hv winding

(d) middle of lv winding

This question was posed to me during an interview for a job.

I'd like to ask this question from Machine Applications in division Electrical Machine Applications/Armature Reaction and Commutation of Electrical Machines

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Right option is (a) middle of hv winding

The explanation: Tappings are provided to tap different levels of voltages at the high voltage end of the transformer. Providing it as low voltage side has no use and it is not economical.

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