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The brushes of a dc motor, are shifted by 5′, from the main field axis, then __________

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The brushes of a dc motor, are shifted by 5′, from the main field axis, then __________

(a) demagnetizing or magnetizing effect may occur depending on machine

(b) cross-magnetization will be pronounced

(c) both cross-magnetization as well as magnetization and demagnetization will occur

(d) none of the mentioned

The question was posed to me in exam.

The above asked question is from MMF and Flux Density Waveforms in DC Machines in portion DC Machines of Electrical Machines

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The correct answer is (a) demagnetizing or magnetizing effect may occur depending on machine

For explanation I would say: When the brushes are shifted from GNA, there will either be magnetizing or demagnetizing effect will be observed.

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