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Why does DC motor sometimes run too fast when under-loaded?

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Why does DC motor sometimes run too fast when under-loaded?

(a) Due to weak field

(b) Due to high line voltage

(c) Due to brush-shifted to neutral

(d) All of the mentioned

The question was posed to me in a job interview.

This intriguing question originated from Speed Control of DC Motors topic in portion DC Motors of Electrical Machines

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The correct choice is (a) Due to weak field

To explain I would say: All of the reasons cause the dc motor to increase in speed when under loaded.

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