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The power rating of the field winding is ___________

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The power rating of the field winding is ___________

(a) equal to the power rating of the machine

(b) 1/2 to 2% of the rated power of the machine

(c) greater than the power rating of the machine

(d) less than the power rating of the machine

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

Query is from Constructional Features of Rotating Electrical Machines-1 topic in division Constructional Features of Rotating Electrical Machines of Electrical Machines

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Right answer is (b) 1/2 to 2% of the rated power of the machine

To explain I would say: The power input to the DC field winding is dissipated as i^2R loss in the field winding (once the required field current is established).

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