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Which of the following cannot reduce the terminal voltage of a dc shunt generator?

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Which of the following cannot reduce the terminal voltage of a dc shunt generator?

(a) Commutation

(b) Armature reaction

(c) Armature ohmic losses

(d) Any of the mentioned

This question was addressed to me in exam.

The above asked question is from EMF Generated in the Armature in section Electromechanical Energy Conversions of Electrical Machines

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Right choice is (a) Commutation

The explanation is: Commutation ideally does not reduce the terminal voltage of a dc machine. If it takes place properly at desired timings, the losses can be avoided. Armature reaction, ohmic losses contribute to the losses in the terminal voltage.

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