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How is the number of armature slots associated with the tooth ripples?

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How is the number of armature slots associated with the tooth ripples?

(a) tooth ripples are increased, if the number of slots are increased

(b) tooth ripples are decreased, if the number of slots are increased

(c) tooth ripples are increased, if the number of slots are decreased

(d) tooth ripples are decreased, if the number of slots are decreased

I had been asked this question during a job interview.

My enquiry is from Armature Design topic in chapter Design of Synchronous Machines of Design of Electrical Machines

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Correct option is (b) tooth ripples are decreased, if the number of slots are increased

Explanation: The tooth ripples in the field form and the consequent pulsation losses in pole face decrease if a large number of slots are used. Also, the waveform of generated voltage is free from ripples.

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