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In amplidynes, the resultant d-axis flux is _________

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In amplidynes, the resultant d-axis flux is _________

(a) field flux

(b) difference of field flux and main flux

(c) sum of field flux and main flux

(d) cross magnetizing flux

This question was addressed to me in examination.

My enquiry is from Rotating Amplifiers in section DC Generators of Electrical Machines

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Right option is (a) field flux

To explain I would say: The resultant d-axis flux lies along the main field poles and are so field flux. The d- axis is completely under the control of field winding and is unaffected by direct axis current.

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